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

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

Example Input: Lemurs live in troops of two and _ individuals.
Example Output: five

Example Input: Humans have _ lungs, each fed by one bronchus.
Example Output:
two