n = int(input())
# 先画下半部分图形
m = n // 2 + 1
# 上半部分
for i in range(m, 1, -1):
    print(' ' * (m - i), end='')
    for j in range(1, 2 * i):
        if j == 1 or j == 2 * i - 1:
            print('X', end='')
        else:
            print(' ', end='')
    print()
# 下半部分
for i in range(1, m + 1):
    print(' ' * (m - i), end='')
    for j in range(1, 2 * i):
        if j == 1 or j == 2 * i - 1:
            print('X', end='')
        else:
            print(' ', end='')
    print()

/**************************************************************
	Problem: 1239
	User: admin
	Language: Python
	Result: Accepted
	Time:94 ms
	Memory:34480 kb
****************************************************************/