You are given a code:

def main_solution(x):
    return func_4(func_13('jhfad', '-'))

Can you predict the output of `main_solution("cgwksbnmy")` 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": "cgwksbnmy"}, "ref_output": "j-h-f-a-d", "ref_code": "def main_solution(x):\n    return func_4(func_13('jhfad', '-'))", "funcname": "main_solution"}
rule