You are given a code:

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

Can you predict the output of `main_solution("ssletxlyvl")` 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": "ssletxlyvl"}, "ref_output": "s-i-s-z-l-x-e-m-t-x-l-y-v-l", "ref_code": "def main_solution(x):\n    return func_13(func_20(x, 'izxm'), '-')", "funcname": "main_solution"}
rule