package m.shin;
import java.util.Scanner;
public class Con18 {

	public static void main(String[] args) {
		Scanner s = new Scanner(System.in);
		String str = s.nextLine();
		s.close();

		byte[] sbyte = str.getBytes();
		for(int i = 0;i < sbyte.length;i++){
			sbyte[i] -= (64 + i + 1);
			while(sbyte[i] <= 0){
				sbyte[i] += 26;
			}
			sbyte[i] += 64;
		}
		System.out.println(new String(sbyte));

	}
}