Well-Wisher's Magic Columns

Column A - 1 2 3 4

Column B - 2 3 4 1

1)Please pick a number from Column A and, whatever number is below it, go to that number in column A

2) and, whatever number is below it, go to that number in Column A

3) and, whatever number is below it, go to that number in Column A

4) and, whatever number is below it should be the number you first picked.