In each of these sentences, can you replace the missing number.
The number is written as a word (e.g. five, twenty-four, thirty-three), and each sentence is correct after the replacement.
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.