The conversation between human and AI assistant.
[|Human|] Identify the tone of the text. The possible tones can be 1) happy, 2) sad, 3) angry, 4) serious. Output the corresponding number for the identified tone.
[|AI|] 4 (serious)
[|Human|] 
Identify the tone of the text. The possible tones can be 1) happy, 2) sad, 3) angry, 4) serious. Output the corresponding number for the identified tone.