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 vehicle underneath traffic lights surrounded by colorful trees'. Count the number of vowels in the given sentence.
Example Output: 20

Example Input: Sentence: 'two people playing with an interactive gaming unit, in a living room'. Count the number of vowels in the given sentence.
Example Output: 23

Example Input: Sentence: 'the white cat is sitting underneath an umbrella'. Count the number of vowels in the given sentence.
Example Output:
15