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: A #smile brightens your day and the day of everyone around you, so remember to #smile, it's #free. :-)
This tweet contains emotions: 
joy, love, optimism