You are given a code:

def main_solution(x):
    return ('zvmp' + 'eswfu')

Can you predict the output of `main_solution("atkhn")` 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": "atkhn"}, "ref_output": "zvmpeswfu", "ref_code": "def main_solution(x):\n    return ('zvmp' + 'eswfu')", "funcname": "main_solution"}
rule