You are given a code:

def main_solution(x):
    return (('mlh' + x) + func_20(x, 'hplpyr'))

Can you predict the output of `main_solution("dkbh")` 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": "dkbh"}, "ref_output": "mlhdkbhdhkpblhpyr", "ref_code": "def main_solution(x):\n    return (('mlh' + x) + func_20(x, 'hplpyr'))", "funcname": "main_solution"}
rule