import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Arrays;

public class Main{
    public static void main(String[] args) {

        try (BufferedReader br = new BufferedReader(new InputStreamReader(System.in))) {
char[] c = br.readLine().toCharArray();
           for (int i = 0; i < c.length; i++) {
				int idx = (int)c[i] - (i + 1) % 26;
					if (idx < 65) {
						System.out.print((char) (idx + 26));
					} else {
						System.out.print((char)idx);
					}
			}
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}