using System;

​

public class Program

{

    public static void Main()

    {

        int a = Convert.ToInt32(Console.ReadLine());

        int b = 0;

        while (a > 0)

        {

            int m = a % 10;

            if (m != 0 || m != 5)

            {

                b = b * 10 + m;

                a /= 10;

            }

            else

            {

                a /= 10;

            }

        }

​

        while (b > 0)

        {

            a = a * 10 + b % 10;

            b /= 10;

        }

​

        Console.WriteLine(a);

    }

}