You are given a code:

def main_solution(x):
    return func_20(func_9('sov'), ('cadw' + 'bsf'))

Can you predict the output of `main_solution("ufpu")` 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": "ufpu"}, "ref_output": "scoavdvwobssf", "ref_code": "def main_solution(x):\n    return func_20(func_9('sov'), ('cadw' + 'bsf'))", "funcname": "main_solution"}
rule