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:
All crabs have ____ pair of chelipeds and four pairs of walking legs .

Ex Output:
one


Ex Input:
Female smokers enter menopause an average of ____ years earlier than nonsmokers.

Ex Output:
five


Ex Input:
Yellow fever begins suddenly after an incubation period of three to ____ days.

Ex Output:

five