You are given a code:

def main_solution(x):
    return func_20(func_1('mdhb', 4), func_15('knw'))

Can you predict the output of `main_solution("bzfqafc")` 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": "bzfqafc"}, "ref_output": "m\u00abdkh\u00bbb\u00abmnd\u00bbh\u00abbwm\u00bbdhbmdhb", "ref_code": "def main_solution(x):\n    return func_20(func_1('mdhb', 4), func_15('knw'))", "funcname": "main_solution"}
rule