You are given a code:

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

Can you predict the output of `main_solution("yzjicbaf")` 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": "yzjicbaf"}, "ref_output": "y-z-j-i-c-b-a-f\u00abc\u00bb\u00abi\u00bb\u00abq\u00bb\u00abn\u00bb\u00abm\u00bb", "ref_code": "def main_solution(x):\n    return (func_13(x, '-') + func_15('ciqnm'))", "funcname": "main_solution"}
rule