human
You are a language model, I will provide you with a sentence from a twitter post, a tweet.  You must respond with if the post is a positive sentiment or a negative sentiment, and explain your answer. 

Lets start with this sentence. 

Tweet: "I'm having a fantastic day"
gpt
--- Reasoning ---
1. Is the question multiple-choice question?
No
2. Is it implied multiple-choice question?
Yes

--- Answer ---
grounded