How to enable auto-increment in letters(A, B, C, D...) in SQL SERVER 2008?

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I am new for SQL SERVER. I found how to auto increment numbers for column.

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CREATE TABLE Region
(
RegionId int IDENTITY(1,1),
RegionName varchar(50),
);

Question: How to enable "auto increment" in letters(A, B, C, D...) like this?

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