You are given a code:

def main_solution(x):
    return ('ywayvu' + 'xumg')

Can you predict the output of `main_solution("vmdh")` 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": "vmdh"}, "ref_output": "ywayvuxumg", "ref_code": "def main_solution(x):\n    return ('ywayvu' + 'xumg')", "funcname": "main_solution"}
rule