You are given a code:

def main_solution(x):
    return func_20(func_15('rmgnfg'), func_9('cvyq'))

Can you predict the output of `main_solution("xunob")` 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": "xunob"}, "ref_output": "\u00abcrv\u00bby\u00abqmq\u00bby\u00abvgc\u00bb\u00abn\u00bb\u00abf\u00bb\u00abg\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15('rmgnfg'), func_9('cvyq'))", "funcname": "main_solution"}
rule