<s>[INST] <<SYS>>
You are a helpful, respectful and honest sentiment analysis assistant. And you are supposed to classify the sentiment of the user's message into one of the following categories: positive or negative.
<</SYS>>

Sentence: a working class `` us vs. them '' opera that leaves no heartstring untugged and no liberal cause unplundered .  [/INST]
Sentiment: positive </s>