You are given a code:

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

Can you predict the output of `main_solution("ovpssdjuhb")` 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": "ovpssdjuhb"}, "ref_output": "\u00abooo\u00bbb\u00abvvd\u00bbp\u00abjps\u00bbs\u00abdsj\u00bbu\u00abhsb\u00bb\u00abd\u00bb\u00abj\u00bb\u00abu\u00bb\u00abh\u00bb\u00abb\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15(x), func_20('obdj', x))", "funcname": "main_solution"}
rule