You are given a code:

def main_solution(x):
    return func_13(func_5(x, 'vw'), '-')

Can you predict the output of `main_solution("yzyjtayswk")` 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": "yzyjtayswk"}, "ref_output": "v-w-y-z-y-j-t-a-y-s-w-k", "ref_code": "def main_solution(x):\n    return func_13(func_5(x, 'vw'), '-')", "funcname": "main_solution"}
rule