Lookup type problem

Hi there

i can't seem to crack this problem...i have a grid with ticks (or "T"'s) on it. its probably easier to see the attached.....but for an input of the first column i want to return the corrosponding letter in the first row based on the tick. i have a one to one relationship inside the grid.

this must be quiet easy? i just can't seem to get a right combination of formulas...i know about the lookups and the match formula?

thanks

pete