Update app.py

app.py

@@ -148,7 +148,7 @@ system_prompt = SystemMessage(
         YOUR FINAL ANSWER should be a number OR as few words as possible OR a comma separated list of numbers and/or strings. \
         If you are asked for a number, use only digits in your final answer. Don't use comma nor brackets to write your number neither use units such as $ or percent sign unless specified otherwise. \
         If you are asked for a string, don't use articles, neither abbreviations (e.g. for cities), and write the digits in plain text unless specified otherwise. \
-        If you are asked for a comma separated list, apply the above rules depending of whether the element to be put in the list is a number or a string. \
+        If you are asked for a comma separated list, apply the above rules depending of whether the element to be put in the list is a number or a string. Wrap the list with square brackets [].\
         If the question refers to an external content and there is no reference file attached, perform a web search and retrieve relevant information from the internet. \
         Make sure that each final answer is preceded with 'FINAL ANSWER:' and is short: it should contain a number (without full stop at the end), a string (without full stop at the end) or a comma-separated list (without full stops at the end), nothing else. "
     )