public static void Roman2(string input1)
        {
            char[] chr = input1.ToCharArray();
            int[] Roman=new int[chr.Length];
            int i = -1;
            foreach (char c in chr)
            {
                i++;
                switch (c)
                {
                    case 'M': Roman[i] = 1000;
                        break;
                    case 'D': Roman[i] = 500; break;
                    case 'C': Roman[i] = 100; break;
                    case 'L': Roman[i] = 50; break;
                    case 'X': Roman[i] = 10; break;
                    case 'V': Roman[i] = 5; break;
                    case 'I': Roman[i] = 1; break;
                    default: Console.WriteLine("WrongInput"); break;
                }
            }
            int result = Roman[Roman.Length - 1];
            for (int j = 0; j < Roman.Length-1; j++)
            {
                if (Roman[j] >= Roman[j + 1])
                {
                    result += Roman[j];
                }
                else
                {
                    result -= Roman[j];
                }
            }
            Console.WriteLine("Roman : "+result);
        }