n, k = map(int, input().split())
sr, sc = map(lambda x:int(x) - 1, input().split())
tr, tc = map(lambda x:int(x) - 1, input().split())
dist = abs(sr - tr) + abs(sc - tc)
if (dist + k) % 2 == 1:
    print(-1)
elif dist <= k <= 2 * dist:
    d = 2 * dist - k
    ans = [[""] * n for _ in range(n)]
    f = (sr + sc) % 2
    for i in range(n):
        for j in range(n):
            if abs(i - tr) + abs(j - tc) <= d:
                ans[i][j] = "."
            else:
                if (i + j) % 2 == f:
                    ans[i][j] = "."
                else:
                    ans[i][j] = "#"
    for i in ans:
        print("".join(i))
else:
    print(-1)