Task: Analyze the tweet's sentiment and assign it to either 'neutral or no emotion' or one or more of the specified emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust).
Tweet: Finished writing my second book tonight. #somber #sad #youpromised #havemercy #author #writer #needpublisher #beingedited #workingonsidebook
This tweet contains emotions: 
joy, optimism, sadness