If you really mean safe you need either cold storage (but that's not that easy to configure properly and use), either hardware wallet.
Even a simple USB stick can do wonders for safe keeping/safely handling your coins... if you have the knowledge for it. But since your money is at a centralized exchange... let's go for a faster and easier route: hardware wallets. They have a big range of prices, it widely depends on how many altcoins you also have and how much you want to pay for the HW. There are plenty of reviews around, you already got a good number of answers.

I want to emphasize something else: it's not enough to just get a safe wallet. It also matters how you store the seed, it matters what other things you do (it's easy to think HW is extremely safe, but you use it with a seed generated online, ie unsafe, or not paying attention to the transactions' addresses and get your money stolen by a clipboard malware).
So take your time and try to learn a little more.