In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.

Example Input: Dairy cows live for _ generations, calve and produce normal milk on a protein-free diet.
Example Output: six

Example Input: Roundworms are fairly large worms that can grow to be _ or five inches long.
Example Output: four

Example Input: Babies crawl into a pouch on the mother's belly and stay there _ months.
Example Output:
four