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: 'several carrots on a cutting board with a knife on top'. Count the number of consonants in the given sentence.
Example Output: 27

Example Input: Sentence: 'many people stand on a sidewalk holding umbrellas'. Count the number of consonants in the given sentence.
Example Output: 27

Example Input: Sentence: 'a little girl standing still and holding a skateboard'. Count the number of vowels in the given sentence.
Example Output:
15