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: Cell division is more complex in eukaryotes than prokaryotes.

Ex Output:
Cell division is.


Ex Input:
Fact: the Earth revolving around the Sun causes the seasons to change on its axis.

Ex Output:
earth axis.


Ex Input:
Fact: a plant requires food for survival.

Ex Output:

food contains nutrients.