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

Input: Consider Input: Who has taken over the TV role of Doctor Who, from actor David Tennant?

Output: doctor who


Input: Consider Input: Who wrote and recorded the original version of the song Blue Suede Shoes which was a hit single for Elvis Presley in 1955?

Output: blue suede shoes


Input: Consider Input: Who had a 2007 hit with Big Girls Don't Cry?


Output: big girls don't cry