You are given a code:

def main_solution(x):
    return func_20(func_20('szduxl', 'znvivh'), func_15('kgd'))

Can you predict the output of `main_solution("bbn")` 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": "bbn"}, "ref_output": "s\u00abzkz\u00bbn\u00abdgv\u00bbu\u00abidx\u00bbvlh", "ref_code": "def main_solution(x):\n    return func_20(func_20('szduxl', 'znvivh'), func_15('kgd'))", "funcname": "main_solution"}
rule