Sometimes you really need a strong password and if you do not have enough of monkey skills to type something like a AhJjk%6Kl!5fSghM.t6Zz0

you can go to https://signup.wordpress.com/signup/ (yes wordpress signup page) they have brilliant  button Generate strong password. Click on it untill you see somehting great for your needs. Quite simply. However typing password in upper paragrapth took me a bit less time 🙂