using System;
using System.Linq;

class Program
{
    static void Main(string[] args)
    {
        string[] abc = new string[] 
        { 
            "A","B","C","D","E","F","G","H","I","J",
            "K","L","M","N","O","P","Q","R","S","T",
            "U","V","W","X","Y","Z"
        };
        string input = Console.ReadLine();
        string[] array = new string[input.Length];
        string output = "";
        int cnt = 0;

        for (int i = 0; i < input.Length; i++)
        {
            array[i] = input[i].ToString();
        }

        for (int i = 0; i < input.Length; i++)
        {
            for (int j = 0; j < 26; j++)
            {
                if (abc[j] == array[i])
                {
                    if (j + i + 1 >= abc.Length)
                    {
                        cnt = (j + i + 1) - 26;
                    }
                    else
                    {
                        cnt = j + i + 1;
                    }
                    output += abc[cnt];
                    break;
                }
            }
        }

        Console.WriteLine(output);
        Console.ReadLine();
    }
}