You are given a code:

def main_solution(x):
    return func_20(func_15('pega'), func_20(x, 'nok'))

Can you predict the output of `main_solution("gcvmboevn")` 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": "gcvmboevn"}, "ref_output": "\u00abgpn\u00bbc\u00aboev\u00bbk\u00abmgb\u00bbo\u00abeav\u00bbn", "ref_code": "def main_solution(x):\n    return func_20(func_15('pega'), func_20(x, 'nok'))", "funcname": "main_solution"}
rule