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: I know it's the final day of summer when it's the finale of @CBSBigBrother #sadness
This tweet contains emotions: 
pessimism, sadness