int a = 1234;
int f = 0;
            Console.WriteLine(a);
            int b = a % 10;
            a = a / 10;
			f = f + b;
            int c = a % 10;
            a = a / 10;
			f = f * 10 + c;
            int d = a % 10;
            a = a / 10;
			f = f * 10 + d;
            int e = a % 10;
            a = a / 10;
			f = f * 10 + e;
            Console.WriteLine(f);