You are given a code:

def main_solution(x):
    return func_20(func_15('ahzfd'), func_17('wtmukn'))

Can you predict the output of `main_solution("kfcv")` 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": "kfcv"}, "ref_output": "\u00abnak\u00bbu\u00abmht\u00bbw\u00abz\u00bb\u00abf\u00bb\u00abd\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15('ahzfd'), func_17('wtmukn'))", "funcname": "main_solution"}
rule