Update app.py

app.py

@@ -189,7 +189,7 @@ class BasicAgent:
             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 your answer with [square brackets]. \
             If there is a file attached, open the file and read it. \
             If you don't have enough references to answer, use your tools, search the web, run your code or convert data to a data frame, whatever helps. \
             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. \