You are given a code:

def main_solution(x):
    return func_20(func_20('hsahn', x), func_15('llhu'))

Can you predict the output of `main_solution("wtmfbn")` 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": "wtmfbn"}, "ref_output": "h\u00abwls\u00bbt\u00abalm\u00bbh\u00abfhn\u00bbb\u00abnu\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_20('hsahn', x), func_15('llhu'))", "funcname": "main_solution"}
rule