Task: Classify the mental state of the tweeter based on the tweet, determining if it is 'neutral or no emotion' or characterized by any of the provided emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust).
Tweet: It's the #FirstDayofFall and I'm so happy. Sipping my #PumpkinSpice flavored coffee and #smiling! Happy Fall everyone! #amwriting
This tweet contains emotions: 
joy, love, optimism