Structured Prompt for TweetEval Emotion Classification

Task: Sentiment classification for tweets.
Labels:
- anger: The tweet expresses frustration, resentment, or rage.
- joy: The tweet expresses happiness, pleasure, or satisfaction.
- optimism: The tweet expresses hopefulness, confidence about the future, or positive anticipation.
- sadness: The tweet expresses sorrow, disappointment, or unhappiness.

Instructions:
1. Read the tweet provided below.
2. Select the most appropriate label from the list above.
3. Output ONLY the label name. Do not include any other text or explanation.

Tweet: {text}

Label: