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: burning fossil fuels increases the carbon in the atmosphere.

Ex Output:
carbon atmosphere.


Ex Input:
Fact: Lung cancer is most often caused by exposure to tobacco smoke.

Ex Output:
lung cancer also called.


Ex Input:
Fact: Lung cancer is most often caused by exposure to tobacco smoke.

Ex Output:

lung cancer also called.