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:
Some children start asking questions when they're ____ or five years old.

Ex Output:
four


Ex Input:
Birds have ____ beak, two wings, and two feet.

Ex Output:
one


Ex Input:
Psychiatrists say one in ____ people are mentally ill.

Ex Output:

four