You are given a code:

def main_solution(x):
    return func_20(func_15('kkooaf'), func_15('ppatux'))

Can you predict the output of `main_solution("qufyuvao")` 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": "qufyuvao"}, "ref_output": "\u00ab\u00abkp\u00bb\u00bb\u00ab\u00abkp\u00bb\u00bb\u00ab\u00aboa\u00bb\u00bb\u00ab\u00abot\u00bb\u00bb\u00ab\u00abau\u00bb\u00bb\u00ab\u00abfx\u00bb\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15('kkooaf'), func_15('ppatux'))", "funcname": "main_solution"}
rule