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 black bear standing on the ground with grass'. Count the number of vowels in the given sentence.
Example Output: 12

Example Input: Sentence: 'dogs are running around while a man on a horse passes through'. Count the number of consonants in the given sentence.
Example Output: 30

Example Input: Sentence: 'a brown dog with his tongue out in a car'. Count the number of consonants in the given sentence.
Example Output:
18