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.

Example Input: Sentence: 'there are three computers on the desk, two of which are turned on'. Count the number of consonants in the given sentence.
Example Output: 32

Example Input: Sentence: 'a girl standing on a sidewalk holding an umbrella'. Count the number of consonants in the given sentence.
Example Output: 26

Example Input: Sentence: 'a bird sitting on a wire in the sky'. Count the number of consonants in the given sentence.
Example Output:
17