You are given a code:

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

Can you predict the output of `main_solution("gmipszzkwy")` 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": "gmipszzkwy"}, "ref_output": "\u00abvgq\u00bbb\u00abgms\u00bbb\u00abviq\u00bbb\u00abgps\u00bbb\u00abvsq\u00bbb\u00abgzs\u00bbb\u00abvzq\u00bbb\u00abgks\u00bbb\u00abw\u00bb\u00aby\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15(x), func_1('vqbgsb', 4))", "funcname": "main_solution"}
rule