def solve():

    N = int(input())

    ans = [['.'] * N for _ in range(N)]
    for y in range(N):
        for x in range(N):
            if y + x in [N - 1, N]:
                ans[y][x] = '#'

    for a in ans:
        print(''.join(a))


# T = int(input())
T = 1
for _ in range(T):
    solve()