Need help with OCR

I am trying to make SCAR find a picture and then if it finds the picture, type some stuff. I tried using bitmaps, but SCAR would see one picture, and couldn't tell the difference between the other pictures because they all have the same colors in them. It sounds like using OCR would be able to help, but I have to idea how to use OCR. I need a way to make SCAR be able to find pictures like these and type in the corresponding letters.

The letters all have the same colors and font so it wouldn't take much.

 

Aaaaa

 

Very easy to do in C++, SCAR is a scripting language with some-what limited capabilities. Although, it is possible it would require way more effort in my opinion.