You are given a code:

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

Can you predict the output of `main_solution("nddyjxcbll")` 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": "nddyjxcbll"}, "ref_output": "n-d-d-y-j-x-c-b-l-l\u00abi\u00bb\u00aba\u00bb\u00abg\u00bb\u00abq\u00bb\u00abc\u00bb\u00abb\u00bb", "ref_code": "def main_solution(x):\n    return (func_13(x, '-') + func_15('iagqcb'))", "funcname": "main_solution"}
rule