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.
 
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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