Fetch , Decode , Execute

Input:

-Keyboard because you type letters into it...
-Mouse because you give command to the computer
-Tablet? if you have one...just like mouse but controlled by pen rather than mouse
-Microphone...because you can speak into it

Output:

-Screen...regardless of it being LCD or CRT they all show the UI (user interface)
-Speakers because sound come out of it for you to hear
-Printer because it turns soft copy into hard copy...on a piece of paper

Processing:

-Central Processing Unit aka CPU which is the brain of the computer
-Graphical Processing Unit aka GPU which is the graphical brain of the computer