Assigning items in a listbox to variables?

Lets say I have a listbox containing:

5
7
2

So item 1 is a 5, item 2 is a 7, and item 3 is a 2.

I want to assign each number to a variable a, b, c.
So how can I get:
a = 5 (listboxitem1)
b = 7 (listboxitem2)
c = 2 (listboxitem3)