title: Characters beyond Z in alphabetic order
body: <p>Ok, this is just a quick question since I'm not able to find the answer myself. In lists of Strings that are ordered alphabetically, using the <code>Collections.sort</code> and <code>compareTo</code> functions, what is the last available character (beyond "ZZZ")?</p>
  
  <p>I would like to know characters beyond "ZZZ" in <code>compareTo</code>'s order, out of curiosity.</p>