You are given a code:

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

Can you predict the output of `main_solution("miu")` 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": "miu"}, "ref_output": "z\u00ab-nl\u00bb-\u00abkk-\u00bbf\u00ab-tx\u00bb-\u00abxm\u00bb\u00abb\u00bb\u00abr\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_13('zlkfxx', '-'), func_15('nktmbr'))", "funcname": "main_solution"}
rule