You are given a code:

def main_solution(x):
    return func_13(func_20(x, 'vqdfhm'), '-')

Can you predict the output of `main_solution("ecxzljnolf")` 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": "ecxzljnolf"}, "ref_output": "e-v-c-q-x-d-z-f-l-h-j-m-n-o-l-f", "ref_code": "def main_solution(x):\n    return func_13(func_20(x, 'vqdfhm'), '-')", "funcname": "main_solution"}
rule