Is it possible to filter data into another column based on a value
inside the sorted data?

To explain, Say I am filtering data in column A to show up in Column B
as just the last digit in column A. Please see below:

Column A column B
-------------- ---------------
12345 5
52459 9
09801 1

I thought maybe using filter this would be possible, but I could not
get it to work. Anyone tried something like this?