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: Steroid hormones are made of lipids, such as phospholipids and cholesterol.

Ex Output:
fats lipids.


Ex Input:
Fact: Cytokinesis is the final stage of cell division in eukaryotes as well as prokaryotes.

Ex Output:
Cytokinesis.


Ex Input:
Fact: Adult sponges produce eggs and sperm.

Ex Output:

adult mature.