filled = "■"
empty = "□"

def draw(prov):
    ret = []
    for _ in range(max(prov)):
        data = []
        for z in range(len(prov)):
            if prov[z] > 0:
                data.append(filled)
            else:
                data.append(empty)
            prov[z] -= 1
        ret.append(data)
    return ret[::-1]


for x in draw([1,2,3,3,2,1,1,2,3,4,5,6,7]):
    print("".join(x))