import java.util.Scanner;
public class No18 {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		char[] s = sc.nextLine().toCharArray();
		for(int i=0;i<s.length;i++){
			s[i]-=(i%('Z'-'A'+1))+1;
			if(s[i]<'A')s[i]+='Z'-'A'+1;
		}
		System.out.println(String.valueOf(s));
	}
}