Given an trivia question precisely answer the question with a word/phrase/name. External resources such as Wikipedia could be used to obtain the facts.

Input: Consider Input: Which London Underground line connects Euston and Waterloo?

Output: northern line


Input: Consider Input: What was the title of Kylie Minogue's tenth album, released in 2007?

Output: x


Input: Consider Input: Whose first hit was Maybellene in 1955?


Output: chuck berry