using System;

public class Program

{

    static void khaibao(out int temp)

        {

            Console.WriteLine("nhap chuoi S: ");

            temp = int.Parse(Console.ReadLine());

        }

        static void Main(string[] args)

        {

            int temp,r;

            int sum = 0;

            int thamsodoixung = 0;

            khaibao(out temp);

            for (r = temp; temp != 0; temp = temp / 10)

               {

                   r = temp % 10;

                   sum = sum * 10 + r;

               }

            if (r == sum)

               {

                   thamsodoixung++;

                   Console.Write("{0} la so doi xung {1}", r, thamsodoixung);

               }

            else

                Console.Write("{0} khong phai la so doi xung",r);

                Console.ReadLine();

    }

}