Easy. When they click on 2, your action adds 2a - the digit followed by a letter. Then Lectora treats this as a character string concatenating them. Ah, now you have to get rid of the "a". Simply add a second action to Subtract a from the variable. Subtract on character strings only works on a perfect match on one or more of the last characters.If a single character does not work, try aa - so add 2aa the subtract aa.
