You are given a code:

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

Can you predict the output of `main_solution("dqvlzufciw")` 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": "dqvlzufciw"}, "ref_output": "d-q-v-l-z-u-f-c-i-w-s-p-e-y", "ref_code": "def main_solution(x):\n    return func_13((x + 'spey'), '-')", "funcname": "main_solution"}
rule