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: International mail consists of ____ categories of mail.

Output: three


Input: Consider Input: Lancelets display all ____ of the vertebrate characteristics throughout their lives.

Output: four


Input: Consider Input: Plants produce seed at ____ years of age.


Output: eight