Why don’t you ask your computer?
Or your brain?
The two are quite different but both work.
A sheet of paper might be useful too if you want to use the second (but isn’t really need for something that simple).
If you want to progress in hacking and programming, you need to always consider this kind of exercise as a challenge, if your mindset is to ask for such simple things, you should just quit all of this, you will never go anywhere.