You are given a code:

def main_solution(x):
    return func_20(func_15('zkitv'), func_20('wledf', x))

Can you predict the output of `main_solution("tpbkh")` 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": "tpbkh"}, "ref_output": "\u00abwzt\u00bbl\u00abpke\u00bbb\u00abdik\u00bbf\u00abht\u00bb\u00abv\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15('zkitv'), func_20('wledf', x))", "funcname": "main_solution"}
rule