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: Morning all! Of course it is sunny on this Monday morning to cheerfully welcome us back to work.:)
This tweet contains emotions: 
joy, optimism