You are given a code:

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

Can you predict the output of `main_solution("ubek")` 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": "ubek"}, "ref_output": "u\u00abboe\u00bbk\u00abkje\u00bbb\u00abuf\u00bb\u00abl\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_9(x), func_15('ojfl'))", "funcname": "main_solution"}
rule