class Program
{
    static void Main(string[] args)
    {
        string inputWord = Console.ReadLine()!;
        int count = 0;

        foreach (char c in inputWord)
        {
            count++;
            char newWord = c;

            if (count >= 26)
            {
                count = 0;
            }

            int index = newWord - count;

            if (index <= 64)
            {
                int num = 64 - index;
                index = 90 - num;
            }
            newWord = (char) (index);
            Console.Write(newWord);
        }
        Console.WriteLine();
    }
}