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: Pacific salmon leave their home stream, swim out to sea and return ____ to six years later to spawn.

Output: one


Input: Consider Input: Phylogenetic analyses confirm ____ mitochondrial mallard clades.

Output: two


Input: Consider Input: Roaches have ____ forewings and two hind wings.


Output: two