You are given a code:

def main_solution(x):
    return func_20(func_15('rzafr'), func_20(x, 'uimoh'))

Can you predict the output of `main_solution("ctfkfyk")` 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": "ctfkfyk"}, "ref_output": "\u00abcru\u00bbt\u00abizf\u00bbm\u00abkao\u00bbf\u00abhfy\u00bbk\u00abr\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15('rzafr'), func_20(x, 'uimoh'))", "funcname": "main_solution"}
rule