You are given a code:

def main_solution(x):
    return func_20(func_15('muv'), func_13('fupx', '-'))

Can you predict the output of `main_solution("xcxwcqpxrh")` 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": "xcxwcqpxrh"}, "ref_output": "\u00abfm-\u00bbu\u00ab-up\u00bb-\u00abxv\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15('muv'), func_13('fupx', '-'))", "funcname": "main_solution"}
rule