n = int(input())
d = [['.'] * n for _ in range(n)]
for i in range(n):
    if n - 1 - i < i:
        d[i] = list(reversed(d[n-1-i]))
    else:
        l = n // 2 - i
        cnt = 2 * i + 1
        for j in range(cnt):
            d[i][l + j] = '#'
    print(''.join(d[i]))