You are given a code:

def main_solution(x):
    return func_20(func_15('omq'), func_20('chymuq', 'yoobp'))

Can you predict the output of `main_solution("rcgrigzglu")` 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": "rcgrigzglu"}, "ref_output": "\u00abcoy\u00bbh\u00abomy\u00bbo\u00abmqb\u00bbupq", "ref_code": "def main_solution(x):\n    return func_20(func_15('omq'), func_20('chymuq', 'yoobp'))", "funcname": "main_solution"}
rule