import java.util.*;
import java.lang.*;
import java.io.*;
public class Main {
    public static void main(String[] args) {
        int n = 7;
        
        for (int i = 1; i <= n; i++) {
            for (int s = 1; s <= n - i; s++) {
                System.out.print(" ");
            }
            for (int j = 0; j < i; j++) {
                System.out.print((char)('A' + j));
            }
            for (int j = i - 2; j >= 0; j--) {
                System.out.print((char)('A' + j));
            }
            System.out.println(); } 
        for (int i = n - 1; i >= 1; i--) {
            for (int s = 1; s <= n - i; s++) {
                System.out.print(" "); }
            for (int j = 0; j < i; j++) {
                System.out.print((char)('A' + j));}
            for (int j = i - 2; j >= 0; j--) {
                System.out.print((char)('A' + j));}
            System.out.println();
        }
    }
}