You are given a code:

def main_solution(x):
    return func_20(func_1('ggdnl', 4), func_15('uwmb'))

Can you predict the output of `main_solution("pgbcfbabqc")` 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": "pgbcfbabqc"}, "ref_output": "g\u00abgud\u00bbn\u00ablwg\u00bbg\u00abdmn\u00bbl\u00abgbg\u00bbdnlggdnl", "ref_code": "def main_solution(x):\n    return func_20(func_1('ggdnl', 4), func_15('uwmb'))", "funcname": "main_solution"}
rule