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

Ex Input:
Who achieved fame for his ,'Confessions Of An English Opium Eater'?

Ex Output:
confessions of an english opium-eater


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

Ex Output:
blue suede shoes


Ex Input:
In which Shakespeare play do the characters Ajax, Achilles and Ulysses appear?

Ex Output:

achilles