n = int(input())
for i in range(1, n + 1):
    for j in range(1, n - i + 1):
        print("*", end='')
    for j in range(1, 2 * i):
        print('@', end='')
    for j in range(1, n - i + 1):
        print("*", end='')
    print()
/**************************************************************
	Problem: 1494
	User: admin
	Language: Python
	Result: Accepted
	Time:120 ms
	Memory:34480 kb
****************************************************************/