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

Ex Input:
Diarrhea is an illness that kills _ and one-half million children per year.

Ex Output:
three


Ex Input:
Sediment consists of _ visually distinct floc layers.

Ex Output:
two


Ex Input:
Wingless nymphs hatch from the eggs and go through _ to five molts before reaching maturity.

Ex Output:

four