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: a warm front causes cloudy and rainy weather.

Ex Output:
cloudy and rainy weather.


Ex Input:
Fact: a sandbar is formed by water moving sediment downstream.

Ex Output:
sandbar habitat.


Ex Input:
Fact: Flatworms belong to the phylum Platyhelminthes.

Ex Output:

Flatworms.