You are given a code:

def main_solution(x):
    return func_20(func_20(x, 'mhdg'), func_15('dibuuf'))

Can you predict the output of `main_solution("ywuhvdd")` 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": "ywuhvdd"}, "ref_output": "y\u00abmdw\u00bbh\u00abuid\u00bbh\u00abgbv\u00bbd\u00abdu\u00bb\u00abu\u00bb\u00abf\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_20(x, 'mhdg'), func_15('dibuuf'))", "funcname": "main_solution"}
rule