help me debug my "word capitalizer" script

[Santosh Kumar]

OK! The bug one fixed. Thanks to Andreas Perstinger.

Let's move to Bug #2:
 2. How do I escape the words that are already in uppercase? For example:

The input file has this:
NASA

The script changes this to:
Nasa

Is it possible to make this script look at a word, see if its first
character is capitalized, if capitalized then skip that word. If not
do the processing? I don't wan to use regex? Do I need it?