You are given a code:

def main_solution(x):
    return func_20(func_15(x), func_5('zgk', 'db'))

Can you predict the output of `main_solution("vuruqknt")` 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": "vuruqknt"}, "ref_output": "\u00abdvb\u00bbz\u00abguk\u00bb\u00abr\u00bb\u00abu\u00bb\u00abq\u00bb\u00abk\u00bb\u00abn\u00bb\u00abt\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15(x), func_5('zgk', 'db'))", "funcname": "main_solution"}
rule