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: 'an elephant standing on a dirt patch near a forest'. Count the number of vowels in the given sentence.
Example Output: 15

Example Input: Sentence: 'there is a broken toilet in the street'. Count the number of vowels in the given sentence.
Example Output: 13

Example Input: Sentence: 'a man riding on the back of a horse'. Count the number of consonants in the given sentence.
Example Output:
16