You are given a code:

def main_solution(x):
    return (func_20('iksc', 'aeivyb') + ('rvotn' + 'hxwmi'))

Can you predict the output of `main_solution("hbxwcntxmb")` 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": "hbxwcntxmb"}, "ref_output": "iakesicvybrvotnhxwmi", "ref_code": "def main_solution(x):\n    return (func_20('iksc', 'aeivyb') + ('rvotn' + 'hxwmi'))", "funcname": "main_solution"}
rule