You are given a code:

def main_solution(x):
    return func_20(func_1('muzvt', 3), func_15('pzm'))

Can you predict the output of `main_solution("kad")` 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": "kad"}, "ref_output": "m\u00abupz\u00bbv\u00abtzm\u00bbu\u00abzmv\u00bbtmuzvt", "ref_code": "def main_solution(x):\n    return func_20(func_1('muzvt', 3), func_15('pzm'))", "funcname": "main_solution"}
rule