MS Excel: How to count occurrences of items in a list?

I have a list of items that looks like this:

A
B
C
A
A
B
D
E
A

Now I want to count the number of occurrences of each item. The result should look like this:

A 4
B 2
C 1
D 1
E 1

How can I do that? It is important to note that this should be flexible. That means if I add item F to the list, that item should also be considered in the result.