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: Calves are spotted when born and develop their brown coats in ____ months.
Example Output: six

Example Input: Pyrimidines contain ____ ring and purines contain two rings.
Example Output: one

Example Input: Antibodies exist as one or more copies of a Y-shaped unit, composed of ____ polypeptide chains.
Example Output:
four