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: Irrigation can increase land productivity by three to ____ times, especially in the north.

Output: seven


Input: Consider Input: Females usually reach sexual maturity at about four years of age, males at about ____ years.

Output: six


Input: Consider Input: Humans exhibit ____ characteristic types of eye motion.


Output: four