You are given a code:

def main_solution(x):
    return ('vkfh' + 'mwxee')

Can you predict the output of `main_solution("ctyuyx")` 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": "ctyuyx"}, "ref_output": "vkfhmwxee", "ref_code": "def main_solution(x):\n    return ('vkfh' + 'mwxee')", "funcname": "main_solution"}
rule