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

Input: Consider Input: Carbon dioxide accounts for _ fourths of the predicted increase in the greenhouse effect.

Output: three


Input: Consider Input: Plants grow to _ feet tall with feathery, smoky purple foliage.

Output: four


Input: Consider Input: Most infants become ready to try solid foods when they are between four and _ months of age.


Output: six