Analyze the sentiment expressed in the tweet. Is it positive, negative, or neutral? Explain the sentiment in relation to the stock mentioned.
TWEET: "@Citi #ImpetusPEFtriathlon has launched! If your firm likes a challenge, sign up a team (25% off)… https://t.co/oMyNMH7sop
" STOCK: Citigroup DATE: 31/01/2017
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 0.0.