Given a sentence, fill out the missing word with a 'no' or a number (between zero and ten). You should write the numbers with english alphabet, like: four instead of 4.

Ex Input:
Tuberculosis develops in ____ stages.

Ex Output:
two


Ex Input:
Fibber content increases ____ to four times that of whole wheat bread.

Ex Output:
three


Ex Input:
Female manatees deliver only one calf every three to ____ years.

Ex Output:

five