You are given a code:

def main_solution(x):
    return func_20(func_15(x), func_13('fomi', '_'))

Can you predict the output of `main_solution("uxhau")` 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": "uxhau"}, "ref_output": "\u00abfu_\u00bbo\u00ab_xm\u00bb_\u00abih\u00bb\u00aba\u00bb\u00abu\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15(x), func_13('fomi', '_'))", "funcname": "main_solution"}
rule