Task: Analyze the tweet's sentiment and assign it to either 'neutral or no emotion' or one or more of the specified emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust).
Tweet: Keep #smiling because life is a beautiful thing and there's so much to #smile about. #MarilynMonroe #KeepSmiling
This tweet contains emotions: 
joy, love, optimism