You are given a code:

def main_solution(x):
    return func_13(func_5('gkmbka', 'xsy'), '-')

Can you predict the output of `main_solution("not")` 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": "not"}, "ref_output": "x-s-y-g-k-m-b-k-a", "ref_code": "def main_solution(x):\n    return func_13(func_5('gkmbka', 'xsy'), '-')", "funcname": "main_solution"}
rule