You are given a code:

def main_solution(x):
    return func_20(func_1(x, 4), func_15('aoic'))

Can you predict the output of `main_solution("xygr")` 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": "xygr"}, "ref_output": "x\u00abyag\u00bbr\u00abxoy\u00bbg\u00abrix\u00bby\u00abgcr\u00bbxygr", "ref_code": "def main_solution(x):\n    return func_20(func_1(x, 4), func_15('aoic'))", "funcname": "main_solution"}
rule