Amend system prompt a little bit

app.py

@@ -76,7 +76,7 @@ class BasicAgent:
         
         **Answer Format Rules**  
         - If the answer is a number, output digits only (no commas, no units, no strings like “one”, “twenty three”).  
-        - If it’s a word or phrase, don't use articles, neither abbreviations (e.g. for cities - New York, not NY).  
+        - If it’s a word or phrase, don't use articles, neither abbreviations (e.g. for cities - Saint Louis, not St. Louis).  
         - If it’s a comma separated list, output a comma-separated list following the above rules for each element.  
         - **Always** output exactly one line as an answer and nothing else.