You are given a code:

def main_solution(x):
    return func_20(func_9('itmh'), func_13('yhal', '_'))

Can you predict the output of `main_solution("lwlemf")` 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": "lwlemf"}, "ref_output": "iyt_mhh_ham_tli", "ref_code": "def main_solution(x):\n    return func_20(func_9('itmh'), func_13('yhal', '_'))", "funcname": "main_solution"}
rule