You are given a code:

def main_solution(x):
    return func_20(func_15('nld'), func_5('hbpvu', 'tnwb'))

Can you predict the output of `main_solution("sktgbjil")` 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": "sktgbjil"}, "ref_output": "\u00abtnn\u00bbw\u00abblh\u00bbb\u00abpdv\u00bbu", "ref_code": "def main_solution(x):\n    return func_20(func_15('nld'), func_5('hbpvu', 'tnwb'))", "funcname": "main_solution"}
rule