You are given a code:

def main_solution(x):
    return func_20(func_9(x), func_15('bheluo'))

Can you predict the output of `main_solution("unhfer")` 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": "unhfer"}, "ref_output": "u\u00abnbh\u00bbf\u00abehr\u00bbr\u00abeef\u00bbh\u00abnlu\u00bb\u00abu\u00bb\u00abo\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_9(x), func_15('bheluo'))", "funcname": "main_solution"}
rule