You are given a code:

def main_solution(x):
    return (func_13(x, '-') + func_15('wti'))

Can you predict the output of `main_solution("csiknakv")` 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": "csiknakv"}, "ref_output": "c-s-i-k-n-a-k-v\u00abw\u00bb\u00abt\u00bb\u00abi\u00bb", "ref_code": "def main_solution(x):\n    return (func_13(x, '-') + func_15('wti'))", "funcname": "main_solution"}
rule