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

Example Input: Females inherit _ X chromosomes, one from each parent.
Example Output: two

Example Input: Cormorants are monogamous and breed in colonies of up to _ thousand pairs.
Example Output: three

Example Input: Liquids usually descend in three to five seconds, and solids in _ to twenty seconds.
Example Output:
eight