Task: Classify the mental state of the tweeter based on the tweet, determining if it is 'neutral or no emotion' or characterized by any of the provided emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust).
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