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: Fish have a circulatory system with a two-chambered heart.

Ex Output:
fish aquatic animals.


Ex Input:
Fact: Air pollution harms the respiratory and circulatory systems.

Ex Output:
Air pollution caused by.


Ex Input:
Fact: keeping food cold is used for keeping food fresh.

Ex Output:

food cold safety.