You are given a code:

def main_solution(x):
    return func_20(('cep' + 'rrlmnp'), func_15('tvztmf'))

Can you predict the output of `main_solution("retsyoqty")` 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": "retsyoqty"}, "ref_output": "c\u00abetp\u00bbr\u00abrvl\u00bbm\u00abnzp\u00bb\u00abt\u00bb\u00abm\u00bb\u00abf\u00bb", "ref_code": "def main_solution(x):\n    return func_20(('cep' + 'rrlmnp'), func_15('tvztmf'))", "funcname": "main_solution"}
rule