Task: Assess the emotional content of the tweet and classify 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 best represent the tweeter's mental state.
Tweet: @WeAreElektron sadly #digitakt seems to be out of stock all over Europe. Do you know  if any European online store that has it?
This tweet contains emotions: 
sadness