for (int i = 1000; i <= 9999; i++)
            {
                string tempi = i.ToString();
                string first, second;
                first = tempi.Substring(0, 2);
                second = tempi.Substring(2, 2);

                int jeden, dwa;
                jeden = Int32.Parse(first);
                dwa = Int32.Parse(second);

                if ((jeden * jeden) + (dwa * dwa) == i)
                {
                    Console.WriteLine(i + " " + jeden + " " + dwa);
                }