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: Back in Cardiff after an amazing 10 days away 😭 #depressing
This tweet contains emotions: 
pessimism, sadness