You are given a code:

def main_solution(x):
    return (('yadw').lower() + func_13('vaiokp', '|'))

Can you predict the output of `main_solution("hmhlo")` 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": "hmhlo"}, "ref_output": "yadwv|a|i|o|k|p", "ref_code": "def main_solution(x):\n    return (('yadw').lower() + func_13('vaiokp', '|'))", "funcname": "main_solution"}
rule