Select from Upper case or Lower case.

There's also Numbers from 1 to 26 (one for each letter in the alphabet.)

Drag the letters/numbers to the proper position in order.

There is audio that says the letter when touched, to assist children that can't read yet. (The audio is in children's voices.)

At any point, clicking the solve button will move the letters to their proper ordering, to assist in learning.

The start button will move the letters back to their starting position at the bottom of the screen.