Teacher:In this task your given a passage and a question in Catalan, you must answer the question based on the passage. The answer to the question can be extracted directly from the passage. The question will have a single correct answer. The answer will be a continuous span of text from the given passage. The correct answer will be short; it will not be more than a few words.
Teacher: Now, understand the problem? Solve this instance: Passage: Any 947, a la vora del llac de Garda, l'aventurer Berengario i el seu fill Aldebert, s'apoderen de la fortalesa de Canossa. L'emperador d'Alemanya, Ottone, ve a socorrer a Adelaide que estima a Aldebert. Els dos homes se la disputen. Ottone li ofereix l'amor i el tron, amb el que Adelaide acaba convertint-se en presonera, en ostatge i en penyora alternativament.
Question: A quin any comenca l'accio?
Student:
947