You are given a code:

def main_solution(x):
    return func_20(func_15(x), ('swxb' + 'cbg'))

Can you predict the output of `main_solution("voimw")` 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": "voimw"}, "ref_output": "\u00absvw\u00bbx\u00abboc\u00bbb\u00abgi\u00bb\u00abm\u00bb\u00abw\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15(x), ('swxb' + 'cbg'))", "funcname": "main_solution"}
rule