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.

Ex Input:
Sexual reproduction involves the union of cells from ____ parents.

Ex Output:
two


Ex Input:
Young bees spend the first ____ to three weeks of their lives carrying out functions within the hive.

Ex Output:
one


Ex Input:
All hornets have ____ sets of wings.

Ex Output:

two