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:
Dogs have to be ____ months old before they are spayed or neutered.

Ex Output:
six


Ex Input:
Water is the only substance on earth found naturally in ____ forms - solid, liquid, and gas.

Ex Output:
three


Ex Input:
Transitional milk is secreted between about ____ days and ten days postpartum.

Ex Output:

four