You are given a code:

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

Can you predict the output of `main_solution("mjpxoypa")` 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": "mjpxoypa"}, "ref_output": "\u00abmrj\u00bbp\u00abxro\u00bby\u00abpia\u00bby\u00abilu\u00bb\u00abm\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15('rrilm'), (x + 'yiu'))", "funcname": "main_solution"}
rule