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:
Marriage is the legal union of ____ people.

Ex Output:
two


Ex Input:
Most children start primary school at ____ years of age.

Ex Output:
five


Ex Input:
Quarks are grouped into ____ pairs.

Ex Output:

three