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:
Most insects have one or ____ pairs of wings.

Ex Output:
two


Ex Input:
Sponges are subdivided into ____ classes.

Ex Output:
three


Ex Input:
Male goats are capable of siring young at the age of ____ months.

Ex Output:

six