Task: Determine the prevailing emotional tone of the tweet, categorizing it as either 'neutral or no emotion' or as one or more of the given emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust) that most accurately represent the tweeter's mental state.
Tweet: the sad moment when u hand in an exam knowing u failed and grieve by eating and sleeping
This tweet contains emotions: 
fear, pessimism, sadness