You are given a code:

def main_solution(x):
    return func_20(func_20(x, 'xvontk'), func_15('frja'))

Can you predict the output of `main_solution("kuz")` 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": "kuz"}, "ref_output": "k\u00abxfu\u00bbv\u00abzro\u00bbn\u00abtjk\u00bb\u00aba\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_20(x, 'xvontk'), func_15('frja'))", "funcname": "main_solution"}
rule