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 man with a stick herds cows down a gravel road'. Count the number of consonants in the given sentence.
Example Output: 25

Example Input: Sentence: 'a baseball player is in his hitting stance as a few people watch'. Count the number of consonants in the given sentence.
Example Output: 32

Example Input: Sentence: 'two polar bear cubs playing by a small pond'. Count the number of vowels in the given sentence.
Example Output:
11