You are given a code:

def main_solution(x):
    return (('yza' + 'xdbv') + func_13('lxmpco', '-'))

Can you predict the output of `main_solution("zmfhxdocgk")` 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": "zmfhxdocgk"}, "ref_output": "yzaxdbvl-x-m-p-c-o", "ref_code": "def main_solution(x):\n    return (('yza' + 'xdbv') + func_13('lxmpco', '-'))", "funcname": "main_solution"}
rule