How do I sort - and count - items in a column?

V

VanS

I have a column like

Grade
A
B
C
A
B
B
C
D
E

and so on. What command shoud I use to sort and get a list of the top
five categories, with a count for each of the five categories, such as
how many A's, B's...?

Thank you.
 
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