import java.util.Scanner;
public class Usa{
	public static void main(String[] arg){
		Scanner sc = new Scanner(System.in);
		char temp;
		char[] c = sc.next().toCharArray();
		for(int i = 0;i<c.length;i++){
			c[i] -= (i+1)%('Z'-'A' + 1);
			if(c[i]<'A')c[i]+='Z'-'A'+1;
		}
		System.out.println(String.valueOf(c));
	}
}