You are given a code:

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

Can you predict the output of `main_solution("dpzavnqcql")` 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": "dpzavnqcql"}, "ref_output": "d-p-z-a-v-n-q-c-q-ldpzavnqcql", "ref_code": "def main_solution(x):\n    return (func_13(x, '-') + (x).lower())", "funcname": "main_solution"}
rule