You are given a code:

def main_solution(x):
    return func_20(func_23('axzcwd', 3), func_15('zvbnjh'))

Can you predict the output of `main_solution("xskltkbt")` 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": "xskltkbt"}, "ref_output": "a\u00abxzz\u00bbc\u00abwvd\u00bb1\u00abb\u00bb\u00abn\u00bb\u00abj\u00bb\u00abh\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_23('axzcwd', 3), func_15('zvbnjh'))", "funcname": "main_solution"}
rule