You are given a code:

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

Can you predict the output of `main_solution("mretxoy")` 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": "mretxoy"}, "ref_output": "m\u00abgmr\u00bbj\u00abero\u00bbt\u00abkex\u00bbx\u00abotg\u00bby\u00abx\u00bb\u00abo\u00bb\u00aby\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_20(x, 'gjokxg'), func_15(x))", "funcname": "main_solution"}
rule