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: Most children recover completely in ____ to three months.
Example Output: two

Example Input: Narwhals have ____ teeth in their upper jaw.
Example Output: two

Example Input: Stoneflies have ____ pairs of wings.
Example Output:
two