Task: Classify the mental state of the tweeter based on the tweet, determining if it is 'neutral or no emotion' or characterized by any of the provided emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust).
Tweet: Tho we haven't talked Jeff but the news is so sad and shocking. R.I.P Jeffrey
This tweet contains emotions: 
sadness