You are given a code:

def main_solution(x):
    return func_20(func_15('nwaof'), ('aiqki' + 'ccj'))

Can you predict the output of `main_solution("utjoby")` 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": "utjoby"}, "ref_output": "\u00abani\u00bbq\u00abkwi\u00bbc\u00abcaj\u00bb\u00abo\u00bb\u00abf\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15('nwaof'), ('aiqki' + 'ccj'))", "funcname": "main_solution"}
rule