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:
Mammals have ____ cervical vertebrae, a number that remains remarkably constant.

Ex Output:
seven


Ex Input:
Black widows mature in two to ____ months.

Ex Output:
four


Ex Input:
Love is the physical and mental compatibility of ____ people.

Ex Output:

two