You are given a code:

def main_solution(x):
    return func_20(func_15(x), (x + 'kfad'))

Can you predict the output of `main_solution("goozr")` 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": "goozr"}, "ref_output": "\u00abggo\u00bbo\u00abzor\u00bbk\u00abfoa\u00bbd\u00abz\u00bb\u00abr\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15(x), (x + 'kfad'))", "funcname": "main_solution"}
rule