You are given a code:

def main_solution(x):
    return func_20(func_15(x), func_20(x, 'cxmtys'))

Can you predict the output of `main_solution("memmizss")` 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": "memmizss"}, "ref_output": "\u00abmmc\u00bbe\u00abxem\u00bbm\u00abmmt\u00bbi\u00abymz\u00bbs\u00absis\u00bb\u00abz\u00bb\u00abs\u00bb\u00abs\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15(x), func_20(x, 'cxmtys'))", "funcname": "main_solution"}
rule