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: Some tropical species have ____ or three generations per year.

Output: two


Input: Consider Input: Scorpions have ____ legs.

Output: eight


Input: Consider Input: Babies show an interest in solid foods when they are approximately ____ to five weeks old.


Output: four