You are given a code:

def main_solution(x):
    return func_20(func_15('kuyz'), func_5('mtcqjx', 'at'))

Can you predict the output of `main_solution("xmilxk")` 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": "xmilxk"}, "ref_output": "\u00abakt\u00bbm\u00abtuc\u00bbq\u00abjyx\u00bb\u00abz\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15('kuyz'), func_5('mtcqjx', 'at'))", "funcname": "main_solution"}
rule