import java.io.*;
import java.util.*;

public class Task1881 implements Runnable {

    private static final boolean ONLINE_JUDGE = System.getProperty("ONLINE_JUDGE") != null;

    private BufferedReader in;
    private PrintWriter out;
    private StringTokenizer tok = new StringTokenizer("");

    private void init() throws FileNotFoundException {
        Locale.setDefault(Locale.US);
        String fileName = "";
        if (ONLINE_JUDGE && fileName.isEmpty()) {
            in = new BufferedReader(new InputStreamReader(System.in));
            out = new PrintWriter(System.out);
        } else {
            if (fileName.isEmpty()) {
                in = new BufferedReader(new FileReader("input.txt"));
                out = new PrintWriter("output.txt");
            } else {
                in = new BufferedReader(new FileReader(fileName + ".in"));
                out = new PrintWriter(fileName + ".out");
            }
        }
    }

    String readString() {
        while (!tok.hasMoreTokens()) {
            try {
                tok = new StringTokenizer(in.readLine());
            } catch (Exception e) {
                return null;
            }
        }
        return tok.nextToken();
    }

    int readInt() {
        return Integer.parseInt(readString());
    }

    long readLong() {
        return Long.parseLong(readString());
    }

    double readDouble() {
        return Double.parseDouble(readString());
    }


    public static void main(String[] args) {
        //new Thread(null, new _Solution(), "", 128 * (1L << 20)).start();
        new Task1881().run();
    }


    @Override
    public void run() {
        try {

            init();
            solve();
            out.close();

        } catch (Exception e) {
            e.printStackTrace();
            System.exit(-1);
        }
    }


    private void solve() throws IOException {
        char[] c = in.readLine().toCharArray();

        for(int i = 0; i < c.length; i++){
            c[i]-=97;
        }


        if (c[0] - 5 < 0) {
            c[0] += 26;
        }

        for(int i = 1; i < c.length; i++){
            if (c[i] < c[i-1]){
                while(c[i] < c[i-1]){
                    c[i]+=26;
                }
            }
        }
        for(int i = c.length - 1; i > 0; i--){
            c[i] -= c[i-1];
        }
        c[0] -= 5;
        for(int i = 0; i < c.length; i++){
            c[i]+=97;
        }

        for(int i = 0; i < c.length; i++){
            out.print(c[i]);
        }






    }


}