using System;
using System.Collections.Generic;

public class InputStrorage
{
    public char[] encrypted;
}

public static class InputHandler
{
    public static void ReadInput(InputStrorage input)
    {
        string str = Console.ReadLine();
        input.encrypted = str.ToCharArray();
    }
}

namespace GeneralLibs
{
    public class Compare
    {
        public static long ReturnMax(long a, long b)
        {
            if (a > b) return a;
            else return b;
        }

        public static long ReturnMax(long[] a)
        {
            long max = long.MinValue;
            for (int i = 0; i < a.Length; i++)
            {
                if (a[i] > max) max = a[i];
            }
            return max;
        }
    }

    public class ShowValues
    {
        public static void ShowArray1D(long[] a, string str = "default")
        {
            Console.WriteLine(str);
            for (int i = 0; i < a.Length; i++)
            {
                Console.Write("{0} ", a[i]);
            }
            Console.WriteLine();
            Console.WriteLine(str);
        }

        public static void ShowValue(long a, string str = "default")
        {
            Console.WriteLine("{0} : {1}", a, str);
        }
    }
}

public class SpecificLibs
{
    public static char[] DecryptString(char[] input)
    {
        for(int i = 0; i < input.Length; i++)
        {
            int shift = (i + 1) % 26;
            int code = (int)input[i];

            code -= shift;
            if (code < 65) code = 90 - (shift - 1);

            input[i] = (char)code;
        }
        return input;
    }
}

static class No18
{
    static void Main()
    {
        InputStrorage input = new InputStrorage();
        InputHandler.ReadInput(input);

        //A=65, Z = 90;
        string ans = new string (SpecificLibs.DecryptString(input.encrypted));
        Console.WriteLine(ans);
    }
}