How to assign a keyboard button to a specific sprite?

Question

Unity

Urgent, need help: how to assign a button to a specific sprite?
Need to assign a sprite to the z button, how?
Here's a snippet of a crude example:
Dictionary dict = new Dictionary();
dict.Add(KeyCode.Z, );

Answer 1

What should be done when the button is pressed?
Can be an array or a list of sprites

List<Sprite> img = new List<Sprite>();
Dictionary dict = new Dictionary();
dict.Add(KeyCode.Z, img[0]);