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: Cells secrete acids and bases to maintain the proper pH for enzymes to work.

Ex Output:
ACIDS AND BASES.


Ex Input:
Fact: a calculator is used for adding.

Ex Output:
adding finance.


Ex Input:
Fact: Most people can survive only a few days without water.

Ex Output:

only the earth contains usable water.