You are given a code:

def main_solution(x):
    return func_20(func_5(x, 'zus'), func_15('josji'))

Can you predict the output of `main_solution("bvatdrngk")` 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": "bvatdrngk"}, "ref_output": "z\u00abujs\u00bbb\u00abvoa\u00bbt\u00abdsr\u00bbn\u00abgjk\u00bb\u00abi\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_5(x, 'zus'), func_15('josji'))", "funcname": "main_solution"}
rule