import java.util.Scanner;
public class array {
	public static void main(String[] args) {
			int [] Buchstaben = new int [26];
			Scanner sc = new Scanner (System.in);
			String a = sc.nextLine();

			for (int f=0 ; f == a.length-1; f++) {
				a.charAt(f);
				for(int g = 65; g > f ; g++){
					System.out.println((char)g);
				}