You are given a code:

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

Can you predict the output of `main_solution("kwzoyzk")` 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": "kwzoyzk"}, "ref_output": "k\u00ab-uw\u00bb-\u00abzn-\u00bbo\u00ab-uy\u00bb-z-k", "ref_code": "def main_solution(x):\n    return func_20(func_13(x, '-'), func_15('unu'))", "funcname": "main_solution"}
rule