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:
Most babies double their birthweight by ____ to five months.

Ex Output:
four


Ex Input:
Young animals become fully mature in about six to ____ years.

Ex Output:

seven