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:
Ospreys mature after ____ years of age.

Ex Output:
two


Ex Input:
Green energy comes in ____ basic forms.

Ex Output:
two


Ex Input:
Some scales possess three or ____ ISOs.

Ex Output:

four