You are given a code:

def main_solution(x):
    return func_20(func_15(x), func_20('jnvnzk', 'fbhble'))

Can you predict the output of `main_solution("hoopdcwulh")` 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": "hoopdcwulh"}, "ref_output": "\u00abjhf\u00bbn\u00abbov\u00bbh\u00abnob\u00bbz\u00ablpk\u00bbe\u00abd\u00bb\u00abc\u00bb\u00abw\u00bb\u00abu\u00bb\u00abl\u00bb\u00abh\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15(x), func_20('jnvnzk', 'fbhble'))", "funcname": "main_solution"}
rule