You are given a code:

def main_solution(x):
    return func_20(('fmcvk' + 'hko'), func_15('dfpvpn'))

Can you predict the output of `main_solution("wpeonaftc")` 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": "wpeonaftc"}, "ref_output": "f\u00abmdc\u00bbv\u00abkfh\u00bbk\u00abop\u00bb\u00abv\u00bb\u00abp\u00bb\u00abn\u00bb", "ref_code": "def main_solution(x):\n    return func_20(('fmcvk' + 'hko'), func_15('dfpvpn'))", "funcname": "main_solution"}
rule