You are given a code:

def main_solution(x):
    return func_13(func_20('mdrtlj', 'dnxt'), '|')

Can you predict the output of `main_solution("vnpvs")` 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": "vnpvs"}, "ref_output": "m|d|d|n|r|x|t|t|l|j", "ref_code": "def main_solution(x):\n    return func_13(func_20('mdrtlj', 'dnxt'), '|')", "funcname": "main_solution"}
rule