You are given a code:

def main_solution(x):
    return func_20(func_20('eptk', x), func_15('lxwn'))

Can you predict the output of `main_solution("zcyb")` 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": "zcyb"}, "ref_output": "e\u00abzlp\u00bbc\u00abtxy\u00bbk\u00abbw\u00bb\u00abn\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_20('eptk', x), func_15('lxwn'))", "funcname": "main_solution"}
rule