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

Example Input: Which English comedian has joined Amanda Holden as one of the judges on the current series of 'Britain's Got Talent'?
Example Output: britain's got talent

Example Input: I which European city will you find 'Dam Square'?
Example Output: dam square

Example Input: Who played the Sundance Kid in the 1969 film `Butch Cassidy and the Sundance Kid`?
Example Output:
butch cassidy