Deliver letters... IN SPACE

You've taken a job as a delivery person in space, transporting letters to floating mailboxes. However, you soon find out that by 'letters' they mean letters of the English alphabet, not writings. Send letters to the floating mailboxes with the left mouse button. The mailboxes themselves also have letters on them. If the letters on the mailboxes form a word, they will disappear and you'll earn poin…