You are given a code:

def main_solution(x):
    return func_20(('iyh' + 'edu'), func_13('qmgym', '_'))

Can you predict the output of `main_solution("uukdbqq")` 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": "uukdbqq"}, "ref_output": "iqy_hme_dgu_y_m", "ref_code": "def main_solution(x):\n    return func_20(('iyh' + 'edu'), func_13('qmgym', '_'))", "funcname": "main_solution"}
rule