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.

Example Input: Ligand seeks ____ receptors into binding and mutual phosporylation.
Example Output: two

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

Example Input: Cubs stay with their mothers from ____ and a half to three years.
Example Output:
one