import java.util.HashMap;
import java.util.Map;
import java.util.Scanner;


public class no18 {
	public static void main(String[] args) {
		String[] az = {"A","B","C","D","E","F","G","H","I","J","K","L","M","N",
					   "O","P","Q","R","S","T","U","V","W","X","Y","Z"};
		Scanner sc = new Scanner(System.in);
		Map<String,Integer> map = new HashMap<String,Integer>();
		for (int i = 0; i < az.length; i++) {
			map.put(az[i],i);
		}
		String s = sc.next();
		int N = 0;
		int azidx = 0;
		for (int i = 0 ; i < s.length(); i++) {
			azidx = map.get(String.valueOf(s.charAt(i))) - (i + 1) % 26;
			if (azidx < 0) {
				N = 26 + azidx;
			} else {
				N = azidx;
			}
			System.out.print(az[N]);
		}
	}
}