You are given a code:

def main_solution(x):
    return func_20(func_20(x, 'illlrv'), func_15('epbo'))

Can you predict the output of `main_solution("etwxnc")` 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": "etwxnc"}, "ref_output": "e\u00abiet\u00bbl\u00abwpl\u00bbx\u00ablbn\u00bbr\u00abcov\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_20(x, 'illlrv'), func_15('epbo'))", "funcname": "main_solution"}
rule