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 baby boy with a banana in his mouth'. Count the number of vowels in the given sentence.
Example Output: 12

Example Input: Sentence: 'a man on a green field throwing a baseball'. Count the number of vowels in the given sentence.
Example Output: 14

Example Input: Sentence: 'a dog and a cat lay on a bed'. Count the number of vowels in the given sentence.
Example Output:
9