Update app.py

app.py

@@ -625,7 +625,7 @@ Please provide:
 2. Specific comments on any errors or oversights
 3. Suggestions for improvement (if any)
 4. A numerical score out of 100 based on the criteria above
-5. Finally, if the numerical is less than 90 out of 100, present a complete revised solution to which you would award a score of 100
+5. Finally, if and only if the numerical score is less than 90 out of 100, present a complete revised solution to which you would award a score of 100
 
 Important: When writing mathematical expressions, use these formatting rules re LaTeX
    - Use $ for inline math