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

Input: Consider Input: Which major river has its source at the confluence of the rivers Brigach and Breg in the Black Forest?

Output: breg


Input: Consider Input: Ashgabat is the capital of which country, a former Soviet republic in Asia?

Output: ashgabat


Input: Consider Input: What city hosted the 2010 Winter Olympics?


Output: 2010 winter olympics