Plugin/template to distribute images into different pre-existing categories?

I'm working on an interface that needs to enable the user to upload 15-200 images and then distribute the images into different categories. The images will be fairly sequential; i.e. images 1-3 go into category A, 4-10 into category B, image 11 into category C, images 12-40 into category D, etc.

Some categories are mandatory and some are optional.

Any recommendations for existing plugins or templates for this functionality?