You are given a code:

def main_solution(x):
    return func_20(func_15('hxibjn'), func_20(x, x))

Can you predict the output of `main_solution("otuopqqu")` 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": "otuopqqu"}, "ref_output": "\u00aboho\u00bbt\u00abtxu\u00bbu\u00aboio\u00bbp\u00abpbq\u00bbq\u00abqjq\u00bbu\u00abun\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15('hxibjn'), func_20(x, x))", "funcname": "main_solution"}
rule