Using the tweet "If you let your insecurities get the best of you,  you will hurt someone unwillingly. I've learned that!  #tired #blah", determine how much sadness is shown. The categories are: 0: no sadness can be inferred, 1: low amount of sadness can be inferred, 2: moderate amount of sadness can be inferred, 3: high amount of sadness can be inferred.