You are given a code:

def main_solution(x):
    return ('nejemh' + 'fgnzt')

Can you predict the output of `main_solution("mvbmszgxgs")` 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": "mvbmszgxgs"}, "ref_output": "nejemhfgnzt", "ref_code": "def main_solution(x):\n    return ('nejemh' + 'fgnzt')", "funcname": "main_solution"}
rule