Update app.py

app.py

@@ -15,7 +15,7 @@ def count_letters_in_name(name: str)-> int: #it's import to specify the return t
     Args:
         name: A string representing a valid name (e.g., 'Geoffrey Hinton')
     """
-    return len(name.replace(' ', '')) if type(name) == 'str' else 0
+    return len(name.replace(' ', '')) if isinstance(name, str) else 0
 
 @tool
 def get_current_time_in_timezone(timezone: str) -> str: