You are given a code:

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

Can you predict the output of `main_solution("vbs")` 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": "vbs"}, "ref_output": "\u00abncb\u00bbo\u00abbwp\u00bbp\u00abbmo\u00bbb\u00abng\u00bb\u00abq\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15('cwmgq'), func_9('nbobp'))", "funcname": "main_solution"}
rule