In this task, you need to count the number of vowels (letters 'a', 'e', 'i', 'o', 'u') / consonants (all letters other than vowels) in the given sentence.

Let me give you an example: Sentence: 'a white cat on a desk near a computer monitor'. Count the number of vowels in the given sentence.
The answer to this example can be: 16
Here is why: This sentence has 5 occurrences of letter 'a', 4 of 'e', 2 of 'i', 4 of 'o', and 1 of 'u'. This adds up to 16. So, the answer is 16.

OK. solve this:
Sentence: 'three dogs are situated next to a door outfitted with a doggy door'. Count the number of vowels in the given sentence.
Answer:
23