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#include<stdio.h> int main() { int a,b,c; while(~scanf("%d%d",&a,&b)) {if(a<10&&b<10)c=a*b; else c=-1; printf("%d\n",c); } }
#include <bits/stdc++.h> using namespace std; int main(){ int a,b;cin>>a>>b; cout<<(a<10&&b<10?a*b:-1)<<endl; return 0; }
#include <iostream> using namespace std; int main(){ int a,b; cin >> a >> b; cout << ((a<=9 && b<=9) ? a*b : -1) << endl; return 0; }
#include <stdio.h> int main(){ int a,b; scanf("%d%d",&a,&b); printf("%d\n",(9<a || 9<b) ? -1 : a*b); }
#include<iostream> using namespace std; int main() { int a,b,n,i; cin>>a>>b; if(a<10&&b<10)cout<<a*b; else cout<<"-1"; return 0; }
#include <bits/stdc++.h> using namespace std; int main() { int N,A; cin>>N>>A; (N>9||A>9)?cout<<"-1":cout<<A*N; }
#include<iostream> using namespace std; int main(){ int A,B; cin >> A >> B; cout << (A<=9 && B<=9 ? A*B : -1); return 0; }
#include<iostream> using namespace std; int main() { int a,b; cin>>a>>b; if(a<10&&b<10) { cout<<a*b<<endl; } else cout<<"-1"<<endl; }
#include <iostream> using namespace std; int main() { int a, b; cin>>a>>b; if (a>9 || b>9) cout<<"-1"; else cout<<a*b; return 0; }
#include<bits/stdc++.h> using namespace std; int main(){ int a,b;cin>>a>>b; if(a<=9 && b<=9)cout<<a*b; else cout<<-1; }
#include <bits/stdc++.h> using namespace std; int main() { int a,b; cin >>a>>b; cout<<(a<=9 && b<=9 ? a*b : -1); }
#include<iostream> using namespace std; int main(){ int a,b;cin >> a >> b; cout << ((a>=10 || b>=10) ? -1:a*b) << endl; }
#include<bits/stdc++.h> using namespace std; int main() { int a,b; cin>>a>>b; if(a<=9 && b<=9) cout<<a*b; else cout<<"-1"; }
#include<bits/stdc++.h> using namespace std; signed main(){ int a,b; cin>>a>>b; cout<<(a<10&&b<10?a*b:-1); }
#include <iostream> int main(){ int a,b; std::cin >> a >> b; std::cout << ((a >= 10 || b >= 10) ? -1 : a*b) << "\n"; }
#include<bits/stdc++.h> using namespace std; int main(){long long t,j; cin>>t>>j; if(t<=9&&j<=9) cout<<t*j; else cout<<-1; return 0; }
#include<iostream> using namespace std; int main() { int A,B; cin>>A>>B; if(A<=9 && B<=9) cout<<A*B; else cout<<-1; return 0; }
#include<stdio.h> int main(){ int A,B; scanf("%d%d",&A,&B); printf("%d",(A>9||B>9)?-1:A*B); return 0; }
#include <bits/stdc++.h> using namespace std; int main() { int a, b; cin >> a >> b; cout << (a > 9 || b > 9 ? -1 : a * b) << endl; }
#include<bits/stdc++.h> using namespace std; int main() { int a,b; cin>>a>>b; if(a<=9 and b<=9) cout<<a*b; else cout<<-1; return 0; }
#include <bits/stdc++.h> using namespace std; int main(){ int A,B; cin >> A >> B; if(A>9 || B>9) cout << -1; else cout << A*B; }
#include<iostream> using namespace std; int main(){ int A,B;cin>>A>>B; if(A<10&&B<10)cout<<A*B; else cout<<-1<<endl; }
#include <iostream> using namespace std; int main() { int A, B; cin >> A >> B; cout << (max(A, B) <= 9 ? A*B : -1); return 0; }
#include<bits/stdc++.h> using namespace std; int main() { int a,b; cin>>a>>b; if(a>9||b>9) printf("-1"); else printf("%d",a*b); }
#include "bits/stdc++.h" using namespace std; int a,b; int main() { cin>>a>>b; if(max(a,b)>9) cout<<-1; else cout<<a*b; }
#include <cstdio> int main(){ int a, b; scanf("%d %d", &a, &b); if(1<=a&&a<=9&&1<=b&&b<=9) printf("%d", a*b); else printf("-1"); }
#include <iostream> using namespace std; int main(){ int a,b; cin >> a >> b; if(a<=9 && b <= 9) cout << a*b; else puts("-1"); }
#import<iostream> int main(){int a,b;std::cin>>a>>b;std::cout<<(a<10&&b<10?a*b:-1);}
#include<bits/stdc++.h> using namespace std; int main() { int a,b; cin>>a>>b; if(a<1||a>9||b<1||b>9) cout<<"-1"; else cout<<a*b; return 0; }
#include <iostream> using namespace std; int main() { int A, B; cin>>A>>B; if(A>9 || A<1 || B>9 || B<1){ cout<<-1; }else{ cout<<A*B; } }
#include <bits/stdc++.h> using namespace std; int main() { int a,b; cin>>a>>b; if(a<10&&b<10)cout<<a*b; else{cout<<-1;} }
#include<stdio.h> int main(){ int A,B,C; scanf("%d%d",&A,&B); C=A*B; if(A>=10||B>=10){ C=-1; } printf("%d\n",C); }
#include<iostream> using namespace std; int main(){ int a,b; cin>>a>>b; if(a<=9&&b<=9){ cout<<a*b; }else{ cout<<-1; } }
#include<iostream> using namespace std; int main(){ int a , b; cin>>a>>b; if(a>9 || b>9)cout<<-1; else cout<<(a*b); return 0 ; }
#include<stdio.h> int main() { int a, b; scanf("%d %d", &a, &b); printf("%d\n", (a>9|b>9)?-1:a*b);}
#include<bits/stdc++.h> using namespace std; int main(){ int A,B; cin>>A>>B; cout<<(A<10&&B<10?A*B:-1); }
#include <iostream> using namespace std; int main() { int a,b; cin>>a>>b; cout<<(a>9||b>9?-1:a*b)<<endl; }
#include <bits/stdc++.h> using namespace std; int main() { int A,B,N=-1; cin>>A>>B; if(A<10 && B<10){ N=A*B;} cout<<N<<endl; }
#include<cstdio> int main() { int m,n; scanf("%d%d",&m,&n); if(0<m&&m<10&&0<n&&n<10)printf("%d",m*n); else printf("-1"); }
#include<bits/stdc++.h> int main(){ int a, b; scanf("%d %d", &a, &b); if(a<10&&b<10) printf("%d\n", a*b); else printf("-1\n"); return 0; }
#include<iostream> using namespace std; int main() { int a,b; cin>>a>>b; if(a>9||b>9) puts("-1"); else cout<<a*b<<endl; return 0; }
#include<iostream> using namespace std; int main(){ int a,b; cin>>a>>b; if(a<=9&&b<=9){ cout<<a*b<<endl; } else{ cout<<"-1"<<endl; } }
#include<iostream> using namespace std; int main(){ int A,B; cin>>A>>B; if(A<10&&B<10){ cout<<A*B; }else{ cout<<-1; } }
#include<bits/stdc++.h> using namespace std; int main() { int a,b; cin>>a>>b; if(a>9||b>9) cout<<-1; else cout<<a*b; return 0; }
#include <bits/stdc++.h> using namespace std; int main(){ int A,B; cin >> A >> B; cout << ( (A<=9 && B<=9) ? A*B : -1) << endl; }
#include <bits/stdc++.h> using namespace std; int main(){ int a,b; cin>>a>>b; if(a>9 || b>9) cout<<"-1"<<endl; else cout<<a*b<<endl; }
#include <bits/stdc++.h> using namespace std; int main(){ int A, B; cin>>A>>B; if (A<10 && B<10) cout<<A*B; else cout<<-1; }
#include <iostream> using namespace std; int a, b; int main() { cin >> a >> b; cout << (a<10 && b<10 ? a*b : -1); return 0; }
#include<stdio.h> int main(){ int a,b,ans; scanf("%d %d",&a,&b); if(a>9||b>9)printf("-1"); else printf("%d",a*b); }
#include<iostream> using namespace std; int main() { int n,m; cin>>n>>m; if(n<=9 && m<=9) cout<<(n*m); else cout<<"-1"; }
#include<cstdio> using namespace std; int main() { int a,b; scanf("%d%d",&a,&b); if(a>9||b>9)printf("-1"); else printf("%d",a*b); return 0; }
#include<bits/stdc++.h> using namespace std; int a,b; int main(){ cin>>a>>b; if(a>9||b>9)cout<<"-1"; else cout<<a*b; return 0; }
#include<bits/stdc++.h> using namespace std; int main(){ int a,b; cin>>a>>b; if(10<=a||10<=b) cout<<"-1"<<endl; else cout<<a*b<<endl; }
#include<iostream> using namespace std; int main() { int A,B; cin>>A>>B; if(A<10&&B<10)cout<<A*B<<endl; else cout<<-1<<endl; }
#include<iostream> int main(){int n,m;std::cin>>n>>m;std::cout<<(n<0||n>9||m<0||m>9?-1:n*m);}
#include <bits/stdc++.h> using namespace std; int main() { int a, b; cin >> a >> b; cout << (a > 9 || b > 9 ? -1 : a * b ); }
#include<bits/stdc++.h> using namespace std; long long a,b; int main(){ cin>>a>>b; if(a>9||b>9)cout<<"-1"; else cout<<a*b; return 0; }
#include<cstdio> int main() { int A, B; scanf("%d%d", &A, &B); printf("%d\n", 1 <= A && A <= 9 && 1 <= B && B <= 9 ? A*B : -1 ); }
#include<iostream> using namespace std; int main() { int a,b; cin>>a>>b; if(a>=0&&a<=9&&b>=0&&b<=9) cout<<a*b; else cout<<"-1"; }
#include<bits/stdc++.h> using namespace std; int main(){ int a,b; cin>>a>>b; if(a<1||a>9||b<1||b>9)cout<<"-1\n"; else cout<<a*b<<"\n"; }
#include <bits/stdc++.h> using namespace std; int main() { int a,b; cin>>a>>b; cout<<((a<10&&b<10)?(a*b):-1); return 0; }
#include<iostream> using namespace std; int main(){ int x,y; cin>>x>>y; if(x>9||y>9) cout<<-1; else cout<<x*y; }
#include <bits/stdc++.h> using namespace std; int main() { int A, B; cin >> A >> B; cout << ((A < 10 && B < 10) ? A * B : -1) << "\n"; }
#include<stdio.h> int main(){ int a,b,c=-1; scanf("%d%d",&a,&b); if(a>=10||b>=10) printf("%d",c); else printf("%d",a*b); return 0; }
#include <iostream> using namespace std; int main() { int a, b; cin >> a >> b; if (a>9 || b>9) cout << -1; else cout << a*b; }
#include<iostream> using namespace std; int main(){ int a,b; cin>>a>>b; int ans=a*b; if(a>9||b>9)ans=-1; cout<<ans<<endl; return 0; }
#include<bits/stdc++.h> using namespace std; int main(){ int a,b,res=-1; cin>>a>>b; if(a<10 && b<10){ res=a*b; } cout<<res; }
#include <bits/stdc++.h> using namespace std; int main(){ int a,b; cin>>a>>b; if(a<=9 && b<=9){ cout<<a*b; }else{ cout<<-1; } return 0; }
#include <iostream> using namespace std; int main() { int a,b; cin>>a>>b; if(a<=9 && b<=9) { cout<<a*b; } else { cout<<"-1"; } }
#include <iostream> using namespace std; int main(){ int a,b; cin>>a>>b; if(a>0&&b>0&&a<10&&b<10) cout<<a*b; else cout<<-1; }
#include<bits/stdc++.h> using namespace std; int main(){ int a,b; cin>>a>>b; cout<<((a<10&&b<10&&a>0&&b>0)?(a*b):(-1))<<endl; }
#include <bits/stdc++.h> using namespace std; int main() { int A,B; cin>>A>>B; printf("%d",(A>9|B>9)?-1:A*B); }
#include <bits/stdc++.h> using namespace std; int main() { long a,b; cin >> a >> b; cout << (a<10 && b<10? a*b : -1) << endl; }
#include<bits/stdc++.h> using namespace std; int main(){ int a,b; cin>>a>>b; if(a<10&b<10) cout<<a*b; else cout<<-1; }
#include <bits/stdc++.h> using namespace std; int main(){ int a,b; cin >> a >> b; cout << (a >= 10 || b >= 10?-1:a*b) << endl; }
#include <iostream> using namespace std; int main() { int a,b,c; cin>>a>>b; if(a>=10||b>=10){c=-1;} else{c=a*b;} cout<<c<<endl; }
#include <bits/stdc++.h> using namespace std; int main(){ int a, b; cin >> a >> b; if(a>9||b>9){cout << -1;} else{cout <<a*b;} }
#include <bits/stdc++.h> using namespace std; int main() { int a,b; cin>>a>>b; if(a>=10 || b>=10) cout<<-1; else cout<<a*b; return 0; }
#include <stdio.h> int main(){ int a,b; scanf("%d%d",&a,&b); if (a<10 && b<10){ printf("%d",a*b); } else{ printf("-1"); } }
#include<bits/stdc++.h> using namespace std; int main () { int a,b; scanf ("%d %d",&a,&b); printf ("%d\n",a>9||b>9?-1:a*b); }
#include <cstdio> int main() { int a, b; scanf("%d %d", &a, &b); printf("%d\n", (a>=10 or b>=10)?-1:(a*b)); return 0; }
#include <iostream> using namespace std; int main() { int a,b; cin >> a >> b; if (a>=10 || b>=10) cout << -1; else cout << a*b; }
#include<iostream> using namespace std; int main(){ int a,b; cin>>a>>b; cout<<(a < 10 && b < 10 ? a * b : -1)<<endl; }
#include <bits/stdc++.h> using namespace std; int main() { int A, B; cin >> A >> B; cout << ( A<10 && B<10 ? (A*B) : -1 ) << endl; }
#include <bits/stdc++.h> using namespace std; signed main(){ int a,b;cin>>a>>b; if(a>9||b>9)cout<<-1<<endl; else cout<<a*b<<endl; }
#include<bits/stdc++.h> using namespace std; int main(){ int a,b;cin>>a>>b; if(max(a,b)>9)cout<<-1<<endl; else cout<<a*b<<endl; }
#include<iostream> using namespace std; int main(){ int a, b; cin>>a>>b; if(max(a,b) > 9) cout<< -1 << endl; else cout<< (a*b) << endl; }
#include<bits/stdc++.h> using namespace std; #define ll long long int main(){ ll a,b; cin>>a>>b; if(a<=9&&b<=9) cout<<a*b; else cout<<-1; }
#include <bits/stdc++.h> using namespace std; int main(void){ int a,b; cin>>a>>b; if(a<=9&&b<=9) cout<<a*b; else cout<<-1; }
#include <iostream> using namespace std; int main() { int a,b,c; cin>>a>>b; c=a*b; if((a>=10)||(b>=10)) c=-1; cout<<c; return 0; }
#include<stdio.h> int main() { int A,B; scanf("%d %d", &A, &B); printf("%d", (A < 10 && B < 10) ? A * B : -1); return 0; }
#include <bits/stdc++.h> using namespace std; int main(){ int A,B; cin >> A >> B; cout << (A<10&&B<10?A*B:-1) << endl; }
#include <bits/stdc++.h> using namespace std; int main() { int N,M; cin>>M>>N; if(N<=9&&M<=9) cout<<N*M; else cout<<-1; }
#include<bits/stdc++.h> using namespace std; int main() { int a,b;cin>>a>>b; if((a>=1&&a<=9)&&(b>=1&&b<=9))cout<<a*b; else cout<<"-1"; }
#include <iostream> using namespace std; int main(){ int a,b; cin>>a>>b; if(a>=10 or b>=10) cout<<-1; else cout<<a*b; }
#include <cstdio> int main() { int a,b; scanf("%d%d",&a,&b); if(a>=10||b>=10)puts("-1"); else printf("%d\n",a*b); return 0; }
#include <iostream> using namespace std; int main() { int a,b; cin>>a>>b; if(a>9||b>9) cout<<-1<<endl; else cout<<a*b<<endl; return 0; }
// A - 9x9 #include <bits/stdc++.h> using namespace std; int main(){ int a,b; cin>>a>>b; cout<< (a<10 && b<10? a*b: -1) <<endl; }
#include<bits/stdc++.h> using namespace std; int main() { int a,b; cin>>a>>b; cout<<(min(a,b)>=1 && max(a,b)<=9?a*b:-1)<<"\n"; return 0; }
#include<iostream> using namespace std; int main() { int A,B; cin>>A>>B; if(A<10 && B<10) cout<<A*B; else cout<<"-1"; return 0; }