Task: Classify the tweet into one of four ordinal classes of intensity of emotion E that best represents the mental state of the tweeter. 0: no E can be inferred. 1: low amount of E can be inferred. 2: moderate amount of E can be inferred. 3: high amount of E can be inferred.
Tweet: Be happy not because everything is good, but because you can see the good side of everything  #optimism
Emotion: joy
Intensity class: 
2: moderate amount of joy can be inferred