using System.Numerics;

public class Program
{
    public static void Main()
    {

        //BigInteger num = BigInteger.Parse(Console.ReadLine() ?? string.Empty);
        //int num = int.Parse(Console.ReadLine() ?? string.Empty);
        //string[] str = (Console.ReadLine() ?? string.Empty).Trim().Split(' ');
        string str = Console.ReadLine() ?? string.Empty;


        string aa = "";
        int count = 0;
        for(int i = str.Length-1; i >= 0; i--)
        {
            count++;
            if (char.IsLower(str[i]))
            {
                count--;
                aa += str[i];
            }
        }
        str= str.Substring(count);
        Console.WriteLine(aa+str);
    }

}