You are given a code:

def main_solution(x):
    return ('vtzn' + 'lvlj')

Can you predict the output of `main_solution("mwpushq")` 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": "mwpushq"}, "ref_output": "vtznlvlj", "ref_code": "def main_solution(x):\n    return ('vtzn' + 'lvlj')", "funcname": "main_solution"}
rule