import java.util.Scanner;
class Usaangou{
	public static void main(String args[]){
		Scanner s = new Scanner(System.in);
		char a[] = s.next().toCharArray();
		int count = 0;
		for(int i = 0; i < a.length; i++){
			if(i <= 26){
				count = i + 1;
			}else{
				count = (i + 1) % 26;
			}
			if(a[i] - count >= 0x41){
				a[i] -= count;
			}else{
				a[i] -= count - 26;
			}
		}
		System.out.println(String.valueOf(a));
	}
}