You are given a code:

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

Can you predict the output of `main_solution("djuk")` 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": "djuk"}, "ref_output": "\u00abndv\u00bbg\u00abqjp\u00bbz\u00abzup\u00bbq\u00abgkv\u00bbn", "ref_code": "def main_solution(x):\n    return func_20(func_15(x), func_9('nvgqpz'))", "funcname": "main_solution"}
rule