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 little girl stands on a tennis court holding a tennis racket'. Count the number of consonants in the given sentence.
Example Output: 33

Example Input: Sentence: 'a living room filled with furniture and a small tv'. Count the number of vowels in the given sentence.
Example Output: 15

Example Input: Sentence: 'a train at a train station with several people walking around'. Count the number of vowels in the given sentence.
Example Output:
22