Task: Categorize the tweet's emotional tone as either 'neutral or no emotion' or identify the presence of one or more of the given emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust).
Tweet: Letting go of anger is key to happiness. Please help me let go of these angry feelings. #happiness #anger
This tweet contains emotions: 
anger, joy, optimism