In this task, you need to write a topic word from the given fact. The topic word must have at least one word overlap with the given fact. The topic word often involves adding a new word from a related concept. In your topic word, use at least one word from the given fact. Topic words with two or more words work best.

Input: Consider Input: Fact: erosion can cause a landslide.

Output: erosion water flow.


Input: Consider Input: Fact: Adolescence is a time of significant mental, emotional, and social changes.

Output: Adolescence.


Input: Consider Input: Fact: Sponges are filter feeders.


Output: Sponges.