HW

            bool areDigsDifferent = true;
            int lastDig, num, tempNum;
            num = int.Parse(Console.ReadLine());
            while (num > 0 && areDigsDifferent)
            {
                lastDig = num % 10;
                tempNum = num / 10;
                while (tempNum > 0)
                {
                    if (tempNum % 10 == lastDig)
                        areDigsDifferent = false;
                    tempNum /= 10;
                }
                num /= 10;
            }
            if (areDigsDifferent)
                Console.WriteLine("Digs are different");
            else
                Console.WriteLine("Digs are not different :( ");