zadacha 1 , purvi , sreden, posleded simvol

string a = Console.ReadLine();
            int br = 0;
            int vs = 0;
            for (int i = 0; i < a.Length; i++)
            {
                br++;
            }
            Console.WriteLine("broqt na bukvite : " + br);
            for (int i = 0; i < a.Length; i++)
            {
                Console.WriteLine("purviqt e " +  a[0]);
                Console.WriteLine("sredniqt e  " + a[a.Length/2]  );
                Console.WriteLine("posledniqt e " + a[a.Length-1]);
                break;
            }