Grade array

Question

How do I make an array be used as an input, like im asking what letter was your first grade, second, third, up to five and count how many total, and give me how many specific letters are entered

Answer 1

Arrays are fix-sized (commonly), so I think you need a collection. For example:
var input = new List<string>();
input.Add("A");
input.Add("B");
input.Add("C");
var total = input.Count;