using System;
using System.Collections.Generic;
using System.Linq;

class Program
{
    static string InputPattern = "InputX";

    static List<string> GetInputList()
    {
        var WillReturn = new List<string>();

        if (InputPattern == "Input1") {
            WillReturn.Add("BCD");
            //AAA
        }
        else if (InputPattern == "Input2") {
            WillReturn.Add("ABCDEFGHIJKLMNOPQRSTUVWXYZ");
            //ZZZZZZZZZZZZZZZZZZZZZZZZZZ
        }
        else if (InputPattern == "Input3") {
            WillReturn.Add(new string('Z', 104));
            //YXWVUTSRQPONMLKJIHGFEDCBAZYXWVUTSRQPONMLKJIHGFEDCB
            //AZYXWVUTSRQPONMLKJIHGFEDCBAZYXWVUTSRQPONMLKJIHGFED
            //CBAZ
        }
        else {
            string wkStr;
            while ((wkStr = Console.ReadLine()) != null) WillReturn.Add(wkStr);
        }
        return WillReturn;
    }

    static void Main()
    {
        List<string> InputList = GetInputList();
        string S = InputList[0];

        var sb = new System.Text.StringBuilder();
        for (int I = 0; I <= S.Length - 1; I++) {
            sb.Append(ZurashiSyori(S[I], I + 1));
        }
        Console.WriteLine(sb.ToString());
    }

    //対象文字を、指定文字分ずらす
    static char ZurashiSyori(char pTarget, int pN)
    {
        while (27 <= pN) pN -= 26;
        char wkChar = (char)(pTarget - pN);
        if ('A' <= wkChar) return wkChar;
        return (char)('Z' - ('A' - wkChar - 1));
    }
}