Task: Categorize the tweet's emotional expression, classifying it as either 'neutral or no emotion' or as one or more of the specified emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust) that reflect the tweeter's state of mind.
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