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()