Update app.py

app.py

@@ -48,8 +48,7 @@ async def submit_answers(session: aiohttp.ClientSession, submit_url: str, submis
     try:
         async with session.post(submit_url, json=submission_data, timeout=60) as response:
             response.raise_for_status()
-            return await response.json
-()
+            return await response.json()
     except aiohttp.ClientResponseError as e:
         print(f"Submission Failed: Server responded with status {e.status}. Detail: {e.message}")
         return None