You are given a code:

def main_solution(x):
    return (('ozdnhn' + 'xbwb') + func_4('sfazdo'))

Can you predict the output of `main_solution("qwf")` 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": "qwf"}, "ref_output": "ozdnhnxbwbsfazdo", "ref_code": "def main_solution(x):\n    return (('ozdnhn' + 'xbwb') + func_4('sfazdo'))", "funcname": "main_solution"}
rule