import java.util.*;

public class Main {
    private static Scanner sc = new Scanner(System.in);
    public static void main(String[] args) throws Exception {
        String s = sc.next();
        StringBuilder sb = new StringBuilder();
        for (int i = 0;i < s.length();i++) {
            char c = s.charAt(i);
            int val = (int)c-(i+1)%26;
            if (val < 65) val += 26;
            sb.append((char)val);
        }
        System.out.println(sb.toString());
    }
}