You are given a code:

def main_solution(x):
    return func_20(func_5('veob', 'rgb'), ('kzarvx' + 'qhv'))

Can you predict the output of `main_solution("rvwpfg")` 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": "rvwpfg"}, "ref_output": "rkgzbavrevoxbqhv", "ref_code": "def main_solution(x):\n    return func_20(func_5('veob', 'rgb'), ('kzarvx' + 'qhv'))", "funcname": "main_solution"}
rule