You are given a code:

def main_solution(x):
    return func_20(func_23(x, 1), func_15('xqdmv'))

Can you predict the output of `main_solution("nxudzz")` 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": "nxudzz"}, "ref_output": "n\u00abxxu\u00bbd\u00abzqz\u00bb1\u00abd\u00bb\u00abm\u00bb\u00abv\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_23(x, 1), func_15('xqdmv'))", "funcname": "main_solution"}
rule