You are given a code:

def main_solution(x):
    return func_20(func_15(x), func_9('ahbwpr'))

Can you predict the output of `main_solution("oymogpk")` 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": "oymogpk"}, "ref_output": "\u00abaoh\u00bbb\u00abwyp\u00bbr\u00abrmp\u00bbw\u00abboh\u00bba\u00abg\u00bb\u00abp\u00bb\u00abk\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15(x), func_9('ahbwpr'))", "funcname": "main_solution"}
rule