Task: Categorize the tweet's emotional expression, classifying 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 reflect the tweeter's state of mind.
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