IF and Search function issue

Ok. I need your help guys , and girls.

=IF(A4>1;(IF(SEARCH("BP";INPUT!BF1;1);"PALLET"); "SHELF");"")

This one won't work. I actually want the following...
The search for BS is not yet in the formula.

So I actually need
- If you search for BP in the cell INPUT!BF1, the result should be PALLET
- If you search for BS in the cell INPUT!BF1, the result should be SHELF
- If the cell INPUT!BF1 is empty, the result should be a blank cell.

Thanks all.