using System;

​

public class Program

{

    public static void Main()

    {

        long k = long.Parse(Console.ReadLine());

        string reversedNum = null;

        for (long i = 0; i < 3; i++)

        {

            reversedNum = null;

            long digit = k % 10;

            if (digit == 0)

            {

                k = k / 10;

                continue;

            }

​

            if (k < 10)

            {

                break;

            }

            k = k / 10;

            reversedNum = digit + reversedNum;

            string newNum = k.ToString();

            reversedNum += newNum;

            k = long.Parse(reversedNum);

        }

        Console.WriteLine(k);

    }

}