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

Example Input: Diatoms look like _ shells that fit together.
Example Output: two

Example Input: Allergic rhinitis is the most common allergic disease, with one in _ Canadian adults affected.
Example Output: five

Example Input: Scorpions have pincers, _ legs and a long tail with a stinger at the tip.
Example Output:
eight