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: Flight 815 crashed on The Lost Island 2004 #lost @JoshuaJThurston
This tweet contains emotions: 
sadness