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 towards the sun , that hemisphere receives more direct sunlight.
Example Output: direct during sunlight summer.

Example Input: Fact: Migrants typically travel long distances.
Example Output: long distances travel time.

Example Input: Fact: Coral reefs provide food and shelter to many ocean organisms.
Example Output:
Coral reef is.