You are given a code:

def main_solution(x):
    return func_20(func_20('qbl', 'mam'), func_15('pdrwq'))

Can you predict the output of `main_solution("pfhrfqbr")` 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": "pfhrfqbr"}, "ref_output": "q\u00abmpb\u00bba\u00abldm\u00bb\u00abr\u00bb\u00abw\u00bb\u00abq\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_20('qbl', 'mam'), func_15('pdrwq'))", "funcname": "main_solution"}
rule