You are given a code:

def main_solution(x):
    return func_20(func_5(x, 'vz'), func_15('bnqvuy'))

Can you predict the output of `main_solution("ilyoork")` 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": "ilyoork"}, "ref_output": "v\u00abzbi\u00bbl\u00abyno\u00bbo\u00abrqk\u00bb\u00abv\u00bb\u00abu\u00bb\u00aby\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_5(x, 'vz'), func_15('bnqvuy'))", "funcname": "main_solution"}
rule