import java.util.Scanner;
public class No0018 {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		String s = sc.nextLine();
		for(int i=0; i<s.length(); i++){
			char c = s.charAt(i);
			int a = (int)c - (i%26) - 1;
			if(a >= 65 && a <= 90){
				c = (char)a;
			}else{
				c = (char)(a + 26);
			}
			System.out.print(c);
		}
		System.out.println();
	}
}