You are given a code:

def main_solution(x):
    return func_20(func_20('xkpbvy', 'agjfc'), func_15(x))

Can you predict the output of `main_solution("zxzvmuyvf")` 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": "zxzvmuyvf"}, "ref_output": "x\u00abazk\u00bbg\u00abpxj\u00bbb\u00abfzv\u00bbc\u00abyv\u00bb\u00abm\u00bb\u00abu\u00bb\u00aby\u00bb\u00abv\u00bb\u00abf\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_20('xkpbvy', 'agjfc'), func_15(x))", "funcname": "main_solution"}
rule