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 zebra with a gazelle in the background in a grassy field'. Count the number of vowels in the given sentence.
Example Output: 18

Example Input: Sentence: 'a woman playing with a dog in a field with a frisbee'. Count the number of vowels in the given sentence.
Example Output: 17

Example Input: Sentence: 'a street lined with buildings and red double deck buses'. Count the number of vowels in the given sentence.
Example Output:
17