# Topic: Pttern Lecture-3 
#Question: Code 1
# With Constraints  ( 0 <= N <= 13 )

n = int(input())
if 0<=n<=13:
	for i in range(n):
		for j in range(i, 2*i+1):
			print(chr(j+65), end=" ")
		print()
else:
	print("Print Enter Number Between 0 to 13")