//No.18 うーさー暗号
import java.util.*;
import java.io.*;
import static java.util.Arrays.*;
import static java.lang.Math.*;

public class No18 {
    
    static final Scanner sc = new Scanner(System.in);
    static final PrintWriter out = new PrintWriter(System.out,false);

    static void solve() {
        String s = sc.next();
        String ans = "";
        for (int i=0; i<s.length(); i++) {
            int x = (s.charAt(i) - (i+1)%26 - 'A');
            while (x < 0) {
                x += 26;
            }
            ans += (char)(x+'A');
        }
        out.println(ans);
    }

    public static void main(String[] args) {
        long start = System.currentTimeMillis();

        solve();
        out.flush();

        long end = System.currentTimeMillis();
        //trace(end-start + "ms");
        sc.close();
    }

    static void trace(Object... o) { System.out.println(deepToString(o));}
}