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: 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