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: Copper has ____ naturally occurring isotopes.

Output: two


Input: Consider Input: Some prisons house up to ____ times their capacity.

Output: seven


Input: Consider Input: Genetic variation arises through ____ processes, mutation and recombination.


Output: two