Given the emotion sadness and the tweet "@MarGraham I am practically obsessed with it, the very thought of their departure makes me feel both melancholic and grateful.  Safe journey", rate the intensity of sadness shown. The rating scale is: 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.
0: no sadness can be inferred