You are given a code:

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

Can you predict the output of `main_solution("oafj")` 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": "oafj"}, "ref_output": "o\u00abakf\u00bbj\u00abjmf\u00bba\u00abop\u00bb\u00abj\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_9(x), func_15('kmpj'))", "funcname": "main_solution"}
rule