using System;

public class Program

{

    public static void Main()

    {

        string s = "keystone-19894937557-media6.voip.snohio.net-1592575313.18781982.WAV";

        int secondIndex = s.IndexOf('-', s.IndexOf('-') + 1);

        if (secondIndex >= 0)

        {

            string result = s.Substring(secondIndex + 1);

            Console.WriteLine("RESULT: {0}", result);

        }

    }

}