'Input Text' help needed for crossword

I’m in the process of ‘trying’ to make a very basic type of crossword.

What I’m trying to do is have many individual Input Text fields, and if one row equals the correct answer then a short movieclip is played.

These are the answers:

And these are the Vars:

if box1 =“C” and box2=“A” and box3=“T” then…

and since C is already filled out in box1, the user only needs to type U in box4 and P in box5 to get the other answer.

I hope this makes sense. My actionscripting skills aren’t the greatest, but if some kind soul, that actually understood what I’m getting at, could point me in the right direction, then that’d make me happy.

Thanks in advance.