You are given a code:

def main_solution(x):
    return func_20(func_15(x), func_20(x, 'bpiz'))

Can you predict the output of `main_solution("mqizbzlhv")` 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": "mqizbzlhv"}, "ref_output": "\u00abmmb\u00bbq\u00abpqi\u00bbi\u00abziz\u00bbb\u00abzzl\u00bbh\u00abvb\u00bb\u00abz\u00bb\u00abl\u00bb\u00abh\u00bb\u00abv\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15(x), func_20(x, 'bpiz'))", "funcname": "main_solution"}
rule