How to drag a div after it has been dropped on a droppable div

How to drag a div after it has been dropped on a droppable div


I tried to search the forum for the answer to this question, but I
must not be using the right key words
I am working on an exercise for a class where we are creating a kind
of spelling game. The user is presented with a div containing 26 divs
which each have a letter of the alphabet in them. They are expected
to drag the letter divs onto a droppable div (with the id of "word")
to spell out the name for a picture displayed on the screen (a cat,
for instance).
My problem is that once the "letter" divs are dragged onto the "word"
div, they are no longer draggable. How do I make them draggable
within the "word" div?
Thanks much in advance!
Megan