title: Unify equal values ​in different column in pandas?
body: <p>Suppose I have a column like so:</p>
  <pre><code>COLUMN A     
  abc           
  dbe        
  dbe        
  abc        
  abc        
  ajk        
  dbe        
  abc        
  </code></pre>
  <p>I expected the follow output:</p>
  <pre><code>KEY  
  abc1   
  dbe1
  dbe2
  abc2
  abc3
  ajk1
  dbe3
  abc4
  </code></pre>
  <p>The point is to give uniqueness to each duplicate.</p>
  <p>Any idea?</p>
  <p>Thank you in advance.</p>