n, k = map(int, input().split())
EPS = 1e-6
for i in range(1, 2001):
    if n / min(k, i) <= i + EPS:
        k = min(k, i)
        at = 0
        cnt = 0
        r = [(max(j * k, n), max((j + 1) * k, n)) for j in range(k)]
        for x in range(k):
            for y in range(k):
                ans = '.'
                if r[y][1] % k > r[y][0] % k:
                    if r[y][1] % k > x and x >= r[y][0] % k:
                        ans = '#'
                elif x >= r[y][0] % k or r[y][1] % k > x:
                    ans = '#'
                print(ans, end="")
            print()
        break