Hãy nhin số 6 trong năm giây (không tính số ở đề bài)
9999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999
