You are given a code:

def main_solution(x):
    return func_20(func_15('npbui'), func_20(x, 'acadiz'))

Can you predict the output of `main_solution("toy")` 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": "toy"}, "ref_output": "\u00abtna\u00bbo\u00abcpy\u00bba\u00abdbi\u00bbz\u00abu\u00bb\u00abi\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15('npbui'), func_20(x, 'acadiz'))", "funcname": "main_solution"}
rule