Puzzle ZSWH

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 exactly {?} E's and not one more.
However, this sentence contains exactly {?} S's, with a single Z.
Finally, to finish, this sentence has exactly {?} I's.

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