You are given a code:

def main_solution(x):
    return func_22(func_20(x, 'nfnrzd'))

Can you predict the output of `main_solution("nwnh")` 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": "nwnh"}, "ref_output": "nnwfnnhrzd", "ref_code": "def main_solution(x):\n    return func_22(func_20(x, 'nfnrzd'))", "funcname": "main_solution"}
rule