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 composed Air on the G String?

Output: air on the g string


Input: Consider Input: What is the county town of Derbyshire?

Output: derbyshire


Input: Consider Input: What important day, started by U.S. Senator Gaylord Nelson (D-Wis), is celebrated in the U.S. on April 22, but by the U.N. on the day of the spring equinox?


Output: april 22