Dear Dad,

$chool i$ really great. I am making lot$ of friend$ and $tudying very hard.

With all my $tuff, I $imply can't think of anything I need, $o if you would like, you can ju$t $end me a card, a$ I would love to hear from you.

Love, Your $on.

And here is Dad's reply:

Dear Son,

I kNOw that astroNOmy, ecoNOmics, and oceaNOgraphy are eNOugh to keep even an hoNOr student busy. Do NOt forget that the pursuit of kNOwledge is a NOble task, and you can never study eNOugh.

Love, Dad