import java.util.*;

public class Run {
    public static void main (String arg[]) {
        Scanner scan = new Scanner(System.in);
        String S = scan.next();
        char[] arrayS = S.toCharArray();

        final int ALF = 'Z' - 'A' + 1;
        for (int i = 0; i < arrayS.length; i++) {
            if (Character.isLowerCase(arrayS[i])||i > 1023) System.exit(1);
            arrayS[i] -= (i + 1)%ALF;
            if (arrayS[i] < 'A') {
                arrayS[i] -= 'A';
                arrayS[i] += 'Z' + 1;
            }
        }
        System.out.println(arrayS);
    }
}