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

Ex Input:
Diffusion occurs between the capillaries of the _ blood supplies.

Ex Output:
two


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

Ex Output:
three


Ex Input:
Utility theory expresses the decision makers' preferences on a scale from _ to one.

Ex Output:

zero