Update app.py

app.py

@@ -7,6 +7,7 @@ if "gridNumbers" not in st.session_state:
     st.session_state.gridNumbers = ["...", "...", "...", "...", "...", "...", "...", "...", "..."]
 if "Value" not in st.session_state:
     st.session_state.Value = "X"
+    
 
 def get_userInput(): 
     input = st.text_input("Enter a number between 1 to 9: ", key="input")
@@ -14,10 +15,13 @@ def get_userInput():
 
 def validate_userInput(user_input):
     if user_input.isdigit():
-        if int(user_input) < 1 or int(user_input) > 9:
+        if int(user_input) < 1 or int(user_input) > 9:                
             return False
-        else:    
-            return True
+        else: 
+            if int(user_input) in st.session_state.legal_numbers:
+                return True
+            else:
+                return False
     else:
         return False
 
@@ -31,8 +35,8 @@ def toggleValue():
         st.session_state.Value = "X"
 
 def display_guide():
-    st.text("How to play: Enter the grid number as shown below to mark 'X' or 'O'. "+
-    "Kinldy pick any number shown in Legal Numbers. " +
+    st.text("How to play: Enter the grid number as shown below to mark 'X' or 'O'. \n "+
+    "Kinldy pick any number shown in Legal Numbers. \n" +
     "Number cannot be repeated more than twice.")
     
     col1, col2, col3 = st.columns(3)