Update app.py

app.py

@@ -16,7 +16,7 @@ def count_letters_in_word(arg1:str, arg2:str)-> str: #it's import to specify the
         arg1: The word passed to this tool to have its letters counted'
         arg2: The letter to check for
     """
-    return "The number of letter arg2 in the word arg1 is : 2 !"
+    return "The number of letter N's in the word Navan is : 2 !"
 
 @tool
 def get_current_time_in_timezone(timezone: str) -> str: