VBA script to sort for non duplicate numbers

I have attached a workbook with integers in sheet 1 and sheet 2 column A. I would like to search these columns and take all non duplicate numbers and put them in sheet 3 column A.

Example:
200
300
200
234
2345

In sheet 3 it would have the following:
200
300
234
2345

I don't want the duplicates. Any help would be helpful.
The range will be growing and shrinking as i go.

You could record a macro while:

Copy Sheet2!A:A and paste to Sheet3!A1

goto [Data] - [RemoveDuplicate]

http://www.youtube.com/watch?v=DlkkT_TAlI8