You are given a code:

def main_solution(x):
    return func_5('mhdqjv', 'zzrd')

Can you predict the output of `main_solution("zstfes")` 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": "zstfes"}, "ref_output": "zzrdmhdqjv", "ref_code": "def main_solution(x):\n    return func_5('mhdqjv', 'zzrd')", "funcname": "main_solution"}
rule