You are given a code:

def main_solution(x):
    return func_20(('bdmbb' + 'cvwi'), func_15('ufleyb'))

Can you predict the output of `main_solution("ybmwa")` 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": "ybmwa"}, "ref_output": "b\u00abdum\u00bbb\u00abbfc\u00bbv\u00abwli\u00bb\u00abe\u00bb\u00aby\u00bb\u00abb\u00bb", "ref_code": "def main_solution(x):\n    return func_20(('bdmbb' + 'cvwi'), func_15('ufleyb'))", "funcname": "main_solution"}
rule