You are given a code:

def main_solution(x):
    return func_20(func_15('keekkw'), func_20('nrewxb', x))

Can you predict the output of `main_solution("fyymjtiyfp")` 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": "fyymjtiyfp"}, "ref_output": "\u00abnkf\u00bbr\u00abyee\u00bby\u00abwem\u00bbx\u00abjkb\u00bbt\u00abiky\u00bbf\u00abpw\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15('keekkw'), func_20('nrewxb', x))", "funcname": "main_solution"}
rule