Extract unique value in list and sort the result

Hi,

I want to extract the unique value in a list and sort:
Column A Column B (RESULT)
1 1
7A 2
1 2A
3 2B
2B 3
2 4 on so on
2A
7
2
5
4
6
6B
6A

Note: All data in Column A - numbers are started '1, '2, 3' and so on (force to text format)
can anybody help me.
Thanks in advance