using System;

public class Program

{

    public static void Main()

    {

        string a1= "aaaabbccc";

        string a2 ="aaaa-bbbb";

        string a3 = "bbbb/cccc";

        string a4 = "aaaa-bbbb/cccc";

        Console.WriteLine(GetSubStr(a1));

        Console.WriteLine(GetSubStr(a2));   

        Console.WriteLine(GetSubStr(a3));

        Console.WriteLine(GetSubStr(a4));

    }

    public static string GetSubStr(string str){

    var dash = str.IndexOf("-");

    var slash = str.IndexOf("/");

    return dash != -1 ? 

    (slash != -1 ? str.Substring(Math.Min(dash, slash) + 1, Math.Max(dash, slash) - Math.Min(dash, slash) -1) : str.Substring(dash + 1)):

    (slash != -1 ? str.Substring(0, slash) : str);  

    }

}