Task: Determine the prevailing emotional tone of the tweet, categorizing it as either 'neutral or no emotion' or as one or more of the given emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust) that most accurately represent the tweeter's mental state.
Tweet: Thank you @Pret 4 giving me a free coffee for bringing my reusable cup to the airport because it was 1st time you saw one. But #depressing
This tweet contains emotions: 
disgust, sadness