use only the first MAX_RESPONSE_CHARACTERS of response

parsers.py

 import ast
 
+MAX_RESPONSE_CHARACTERS = 5000
+
 
 class ShoppingBenchTaskParsers:
     """
@@ -49,6 +51,9 @@ class ShoppingBenchTaskParsers:
             response, str
         ), f"Response must be a string, but got {type(response)}"
 
+        # Consider only the first MAX_RESPONSE_CHARACTERS
+        response = response[:MAX_RESPONSE_CHARACTERS]
+
         # Attempt to retrieve the appropriate parser method for the task type.
         parser_method = task_parser_methods.get(self.task_type)