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: All plants have a characteristic life cycle that includes alternation of generations.
Example Output: alternation generations.

Example Input: Fact: Yeast reproduce asexually by budding.
Example Output: Yeast.

Example Input: Fact: when the season changes , the amount of daylight will change.
Example Output:
amount of daylight flower.