You are given a code:

def main_solution(x):
    return func_20(func_15(x), func_5(x, 'oep'))

Can you predict the output of `main_solution("pvkcunmj")` 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": "pvkcunmj"}, "ref_output": "\u00abope\u00bbp\u00abpvv\u00bbk\u00abcku\u00bbn\u00abmcj\u00bb\u00abu\u00bb\u00abn\u00bb\u00abm\u00bb\u00abj\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15(x), func_5(x, 'oep'))", "funcname": "main_solution"}
rule