You are given a code:

def main_solution(x):
    return func_13(('bmkmq' + 'nkzk'), '-')

Can you predict the output of `main_solution("cfipw")` 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": "cfipw"}, "ref_output": "b-m-k-m-q-n-k-z-k", "ref_code": "def main_solution(x):\n    return func_13(('bmkmq' + 'nkzk'), '-')", "funcname": "main_solution"}
rule