Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.

Input: Consider Input: Ride of the Valkyries is the official quick march of which branch of the British Army?

Output: british army


Input: Consider Input: Which 'Coronation Street' character was played for may years by Jean Alexander?

Output: jean alexander


Input: Consider Input: What is the name of the photograph taken by Voyager 1 of the Earth against the vastness of space which lent itself to the title of a 1994 book by Carl Sagan?


Output: carl sagan