You are given a code:

def main_solution(x):
    return func_20(func_15(x), func_15('xeyduv'))

Can you predict the output of `main_solution("rbbgyufarq")` 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": "rbbgyufarq"}, "ref_output": "\u00ab\u00abrx\u00bb\u00bb\u00ab\u00abbe\u00bb\u00bb\u00ab\u00abby\u00bb\u00bb\u00ab\u00abgd\u00bb\u00bb\u00ab\u00abyu\u00bb\u00bb\u00ab\u00abuv\u00bb\u00bb\u00abf\u00bb\u00aba\u00bb\u00abr\u00bb\u00abq\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15(x), func_15('xeyduv'))", "funcname": "main_solution"}
rule