Task: Classify the tweet's emotional intensity into one of four ordinal levels of emotion E, providing insights into the mental state of the user. 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: @British_Airways just came of BA6426 at @ortambo_int at least 6 passengers with broken bags. This was a new suitcase. #unhappy customer
Emotion: sadness
Intensity class: 
3: high amount of sadness can be inferred