You are given a code:

def main_solution(x):
    return func_4('ben')

Can you predict the output of `main_solution("zme")` without writing any code? Please reason and put your final answer in the following json format: {"output": <your output>}, where <your output> should be the final string.
user
{"ref_input": {"x": "zme"}, "ref_output": "ben", "ref_code": "def main_solution(x):\n    return func_4('ben')", "funcname": "main_solution"}
rule