Split a file into a list
<p>This is what I have so far:</p>

<pre><code>EX1 = open('ex1.txt')
EX1READ = EX1.read()
X1READ.splitlines(0)

['jk43:23 Marfield Lane:Plainview:NY:10023',
 'axe99:315 W. 115th Street, Apt. 11B:New      York:NY:10027',
 'jab44:23 Rivington Street, Apt. 3R:New York:NY:10002',
 'ap172:19 Boxer Rd.:New York:NY:10005',
 'jb23:115 Karas Dr.:Jersey City:NJ:07127',
 'jb29:119 Xylon Dr.:Jersey City:NJ:07127',
 'ak9:234 Main Street:Philadelphia:PA:08990']
</code></pre>

<p>I'd like to be able to just grab the userId from this list and print it alphabetized.  Any hints would be great.</p>
