Update app.py

app.py

@@ -209,15 +209,15 @@ def calculate_score_and_grade(llm_response):
     percentage = (total_score / max_possible_score) * 100 if max_possible_score > 0 else 0
 
     if percentage > 90:
-        grade = 'O'
+        grade = 'O-grade'
     elif 80 <= percentage <= 90:
-        grade = 'A'
+        grade = 'A-grade'
     elif 70 <= percentage < 80:
-        grade = 'B'
+        grade = 'B-grade'
     elif 60 <= percentage < 70:
-        grade = 'C'
+        grade = 'C-grade'
     elif 50 <= percentage < 60:
-        grade = 'D'
+        grade = 'D-grade'
     else:
         grade = 'Fail'