You are given a code:

def main_solution(x):
    return func_20(func_13(x, '-'), func_15('ymed'))

Can you predict the output of `main_solution("vepxlsbwcv")` 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": "vepxlsbwcv"}, "ref_output": "v\u00ab-ye\u00bb-\u00abpm-\u00bbx\u00ab-el\u00bb-\u00absd-\u00bbb-w-c-v", "ref_code": "def main_solution(x):\n    return func_20(func_13(x, '-'), func_15('ymed'))", "funcname": "main_solution"}
rule