You are given a code:

def main_solution(x):
    return func_20(func_15(x), func_23('usevtw', 2))

Can you predict the output of `main_solution("ifrkupx")` 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": "ifrkupx"}, "ref_output": "\u00abuis\u00bbe\u00abvft\u00bbw\u00ab1r\u00bb\u00abk\u00bb\u00abu\u00bb\u00abp\u00bb\u00abx\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15(x), func_23('usevtw', 2))", "funcname": "main_solution"}
rule