You are given a code:

def main_solution(x):
    return func_20(func_15('gxbqa'), (x + x))

Can you predict the output of `main_solution("pibmuivtgq")` 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": "pibmuivtgq"}, "ref_output": "\u00abpgi\u00bbb\u00abmxu\u00bbi\u00abvbt\u00bbg\u00abqqp\u00bbi\u00abbam\u00bbuivtgq", "ref_code": "def main_solution(x):\n    return func_20(func_15('gxbqa'), (x + x))", "funcname": "main_solution"}
rule