while True:
    h, w = map(int, input().strip().split())
    if h == w == 0: break
    for x in range(h):
        for y in range(w):
            if x == 0 or x == h - 1 or y == 0 or y == w - 1:
                print('#', end="")
            else:
                print(".", end="")
        print("")
    print("")