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: finally leaving my first job soon. i've been working here since i was 16. going to be kind of bitter sweet
This tweet contains emotions: 
sadness