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.

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

Output: five


Input: Consider Input: Cells contain ____ families of small organic molecules.

Output: four


Input: Consider Input: Some perennials take ____ or more years to produce flowers.


Output: three