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

Example Input: Boolean operations is a method of combining _ meshes together.
Example Output: two

Example Input: Rheas are brownish instead of black like the ostrich and have _ toes instead of two.
Example Output: three

Example Input: Flowers have a _ tolerance for pests and pest damage.
Example Output:
zero