1338 : 문자삼각형1

n = int(input())

arr = [[0 for i in range(n+1)] for j in range(n+1)]
alph=ord('A')

y=0
x=n-1
for i in range(n,0,-1):
    for j in range(i):
        arr[y+j][x-j]=alph
        alph+=1
        if alph > ord('Z'):
            alph = ord('A')
    y+=1

for i in range(n):
    for j in range(n):
        if arr[i][j]==0:
            print(' ',end=' ')
        else:
            print(chr(arr[i][j]),end=' ')
    print()