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: Birds evolved from a group of bipedal dinosaurs called theropods.

Ex Output:
Birds evolved.


Ex Input:
Fact: Organs of excretion make up the excretory system.

Ex Output:
Organs of excretion kidney.


Ex Input:
Fact: Cell division is how organisms grow and repair themselves.

Ex Output:

Cell division mitosis.