Here is an activity for you to do. Either at home or at a staff meeting! Get yourself a pen and paper and a timer/stopwatch. Time yourself or get some one else to time you whilst writing down the following on your piece of paper, from top to bottom, as fast as you can:
A1, B2, C3, etc, all the way down to Z26.
The rule is to write each letter with the correlating number next to it, before you go to the next letter.