Analyze the sentiment expressed in the tweet. Is it positive, negative, or neutral? Explain the sentiment in relation to the stock mentioned.
TWEET: "Interested in the new @Apple Watch’s ability to detect atrial fibrillation, but disappointed it appears to be US on… https://t.co/X4fB661gDs

" STOCK: Apple DATE: 13/09/2018
Sentiment: (Provide sentiment here)
Explanation: The tweet sentiment is related to the stock mentioned, and it's important to interpret the context. The LSTM polarity score is 1 and the TextBlob polarity score is -0.1212121212121212.