Task: Evaluate the tweet for emotional cues and classify it as either 'neutral or no emotion' or as one or more of the specified emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust) that indicate the tweeter's state of mind.
Tweet: Sometimes, you have to smile, pretend everything is okay, and just walk away.
This tweet contains emotions: 
joy, optimism, sadness