Spelling

Leo went to sleep the other night asking why is the word "a" just spelled a but the word "you" is not spelled u? I let it go, saying, "yeah that is very interesting, go to sleep". Paul however, is going through every letter of the alphabet, "well, you have bee, 'c' is see..." They are having a great time and Leo is learning the difference between pee and pea and tea and tee.