Task: Identify the primary emotion conveyed in the tweet and assign it to either 'neutral or no emotion' or one or more of the provided emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust) that best capture the tweeter's mental state.
Tweet: when season 13 of greys anatomy premieres today. it you're only on season 7 #sadness :(
This tweet contains emotions: 
sadness