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: 'a white toilet with a wooden toilet seat on top of it'. Count the number of vowels in the given sentence.
Example Output: 20

Example Input: Sentence: 'a man and a woman with smiles behind tennis racquets'. Count the number of vowels in the given sentence.
Example Output: 16

Example Input: Sentence: 'a giraffe standing in the middle of a lush green field'. Count the number of vowels in the given sentence.
Example Output:
17