Can you please tell me how to lookup cells and transfer them to a list,

eg

Data in sheet 1
A B

2 100
5 50
4 75
2 250
5 95
2 60

I want to lookup the value "2" in the Column A of the data in sheet 1 and
and transfer to another sheet to appear as below(keeping in mind i dont want
blanks cells where the other A values were);

Sheet 2
A B

2 100
2 250
2 60

Thank you in advance
Dan