You are given a code:

def main_solution(x):
    return func_5(func_9('rkskf'), 'zehy')

Can you predict the output of `main_solution("mgbmkaehvm")` 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": "mgbmkaehvm"}, "ref_output": "zehyrkskffkskr", "ref_code": "def main_solution(x):\n    return func_5(func_9('rkskf'), 'zehy')", "funcname": "main_solution"}
rule