You are given a code:

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

Can you predict the output of `main_solution("mnch")` 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": "mnch"}, "ref_output": "u\u00abpke\u00bbe\u00abpbu\u00bb\u00abi\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_9('upe'), func_15('kbi'))", "funcname": "main_solution"}
rule