The conversation between human and AI assistant.
I am the first on Earth, the second in Heaven. I appear two times in a week  you can only see me once in a year. Although I am in the middle of the sea, l am not found in month, but l am in February, June, September, October, November & December. What am I?
Hmm, that's a tough one. What's the answer?
The answer is 'a fence'. A fence runs all around a backyard, but it doesn't move.