Task: Identify the primary emotion conveyed in the tweet and assign it to either 'neutral or no emotion' or one or more of the provided emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust) that best capture 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