char[] alfabet = "ABCDEFGHIJKLMNOPQRSTUWXYZ".ToCharArray();
            //int[] iloscLiter = new int[25] {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};

            Console.WriteLine("Wprowadz tekst:");
            String tekst = Console.ReadLine();
            double[] iloscLiter = new double[25];
            for (int i = 0; i < alfabet.Length;i++) iloscLiter[i] = .0;
            int j = 0;
            int petla = 0;
            foreach ( char indeks in tekst )
                {
                bool czywszedl = false;
                while (!czywszedl)
                {

                    if (Char.Equals(indeks, alfabet[j]))
                    {
                        iloscLiter[j] = iloscLiter[j]+1;
                        //petla=petla+1;
                        czywszedl = true;
                    }
                    else j++;

                }j = 0; petla++;
                }
            double[] Srednia = new double[25];
            for (int i = 0; i < alfabet.Length; i++)
            {
                Srednia[i] = iloscLiter[i] / tekst.Length;
            }
            double max = Srednia.Max();
            int przesuniecieDeszyfr = Srednia.ToList().IndexOf(max);