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

Example Input: Ticks are small round arachnids with _ legs and can have either a soft or hard body.
Example Output: eight

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

Example Input: Tennis is day or night on _ all-weather courts.
Example Output:
two