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: Roundworms reproduce sexually.

Ex Output:
reproduce their young.


Ex Input:
Fact: an automobile engine transforms chemical energy into mechanical energy.

Ex Output:
automobile engine.


Ex Input:
Fact: Animals can communicate with sounds, chemicals, or visual cues.

Ex Output:

animal bat.