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, 
The 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 
Your $on.