You are given a code:

def main_solution(x):
    return func_20(func_22(x), func_15('lnuh'))

Can you predict the output of `main_solution("cktcgbfwo")` 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": "cktcgbfwo"}, "ref_output": "c\u00abklt\u00bbc\u00abgnb\u00bbf\u00abwu\u00bb\u00abh\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_22(x), func_15('lnuh'))", "funcname": "main_solution"}
rule