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: Ligand seeks ____ receptors into binding and mutual phosporylation.

Output: two


Input: Consider Input: Every human being carries six to ____ abnormal recessive genes.

Output: eight


Input: Consider Input: Babies are born about ____ weeks after mating .


Output: five