In each of these three sentences, can you replace the missing number, which appears as a hyphenated word. For example, twenty-one, thirty-two, etc.
This sentence contains {?} letters, one hyphen, two commas and a full stop.
Interestingly, this sentence contains {?} letters, one hyphen, three commas and the final full stop.
Finally, this sentence contains {?} letters, one hyphen, three commas and one full stop.