You are given a code:

def main_solution(x):
    return func_20(func_5(x, 'pbj'), func_15('jfb'))

Can you predict the output of `main_solution("rqzaz")` 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": "rqzaz"}, "ref_output": "p\u00abbjj\u00bbr\u00abqfz\u00bba\u00abzb\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_5(x, 'pbj'), func_15('jfb'))", "funcname": "main_solution"}
rule