using System;
using System.Text;

namespace BaiTrenLopNgay23vs2
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.OutputEncoding = Encoding.UTF8;
            string H = "https://www.hutech.edu.vn/khoacntt";

            string[] arr = H.Split('.');
            Console.WriteLine("{0}", arr[1]);
            string[] a = H.Split('/');
            Console.WriteLine("{0}", a[3]);

            int vt = H.LastIndexOf("/");
            string Khoa = H.Substring(vt +1);
            Console.WriteLine(Khoa);

            int vt2 = H.IndexOf("hutech");
            string Ht = H.Substring(vt2,6);
            Console.WriteLine(Ht);

            Console.ReadLine();
        }
    }
}