The conversation between human and AI assistant.
[|Human|] Find the fourth element in the following array: [1, 3, 5, 7, 9]
[|AI|] The fourth element in the array [1, 3, 5, 7, 9] is 7.
[|Human|] 
Find the fourth element in the following array: [1, 3, 5, 7, 9]