Hello, all I am just wondering what the [Letter] does? I am fairly new to the programming world (have taken some classes in college but have not learned all that much) and I have yet to see or find out what it is this does. Sorry if it is talked about in the video but I have re-watched it and yet to find it. Thank you for any help you can give. By the way, I am loving the course so far and feel as if I am learning so much more doing this course then the ones I have taken in college.