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.

Ex Input:
Fact: gravity pulls objects towards planets.

Ex Output:
gravity objects planets.


Ex Input:
Fact: Fish have a centralized nervous system with a brain.

Ex Output:
brain allows thinking.


Ex Input:
Fact: smoking tobacco decreases stamina.

Ex Output:

cigarettes tobacco.