You are given a code:

def main_solution(x):
    return func_20(func_20('vdfvt', 'bkwms'), func_15('vtvbhd'))

Can you predict the output of `main_solution("csx")` 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": "csx"}, "ref_output": "v\u00abbvd\u00bbk\u00abftw\u00bbv\u00abmvt\u00bbs\u00abb\u00bb\u00abh\u00bb\u00abd\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_20('vdfvt', 'bkwms'), func_15('vtvbhd'))", "funcname": "main_solution"}
rule