Please I need some help on this one. Thanks!

I have an spreadsheet with two colums, Column A and Column B:

Column A Column B
1000 G1
2000 H21
4000 F5
6000 W10

I want a macro that will copy the value in colum A (1000, 2000...) in the destination cells that are in column B (Cell G1, Cell H21, Cell F5, Cell W10...)

So as a result, the values in colum A will move to the cells stated in Column B

Thanks,
Urtzi