You are given a code:

def main_solution(x):
    return func_20(func_4(x), func_15('lbw'))

Can you predict the output of `main_solution("fuuuqpyhqw")` 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": "fuuuqpyhqw"}, "ref_output": "f\u00abulu\u00bbu\u00abqbp\u00bby\u00abhwq\u00bbw", "ref_code": "def main_solution(x):\n    return func_20(func_4(x), func_15('lbw'))", "funcname": "main_solution"}
rule