Update app.py

app.py

@@ -246,7 +246,7 @@ def get_links(user_input):
 
 def validation(user_input):
     user_words = set(user_input.lower().split())
-    if any(word in stop_words for word in user_words):
+    if any(word not in stop_words for word in user_words):
         return "valid"
     else:
         return "invalid"