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: Texans and Astros both shut out tonight. Houston, we're back to normal. #texans #Astros #sadness #losers
This tweet contains emotions: 
sadness