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.

Example Input: Fact: when a hemisphere is tilted away from the sun , that hemisphere receives less direct sunlight.
Example Output: a hemisphere is tilted away from the sun.

Example Input: Fact: a plants require water for survival.
Example Output: bamboo plant.

Example Input: Fact: Autotrophs are also called producers.
Example Output:
Autotrophs.