You are given a code:

def main_solution(x):
    return func_20(func_15(x), ('muyosa' + x))

Can you predict the output of `main_solution("hmgivvbd")` 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": "hmgivvbd"}, "ref_output": "\u00abmhu\u00bby\u00aboms\u00bba\u00abhgm\u00bbg\u00abiiv\u00bbv\u00abbvd\u00bb\u00abv\u00bb\u00abb\u00bb\u00abd\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15(x), ('muyosa' + x))", "funcname": "main_solution"}
rule