In this task, you are given a text from tweets. Your task is to classify given tweet text into two categories: 1) positive, and 2) negative based on its content.

Example Input: Safari &amp; WebKit keeps crashing for no reason after a while. Switching to Firefox 
Example Output: negative

Example Input: New picture is up on flickr!  Fun shot today 
Example Output: positive

Example Input: the lack of sleep is catching up to me  Except I took a nap and I haven't woken up yet. Now does that make any since?
Example Output:
negative