Task: Identify the primary emotion conveyed in the tweet and assign it to either 'neutral or no emotion' or one or more of the provided emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust) that best capture 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