what is the next value? 1 I 2 L 3 F 4 G, E, S or T

I'm going to rewrite this so it's legible:

what is the next value? 1 I 2 L 3 F 4... is it G, E, S or T?

Hint: consider how the letter I might relate to the number 1. Then same with how L relates to 2 and F to 3. Specifically think of the physical attributes of each of these capital letters. Then - what letter has 4 of those physical attributes? It'll come to you I'm sure.