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 variety of sheep and goats drinking from a pond and eating'. Count the number of vowels in the given sentence.
Example Output: 19

Example Input: Sentence: 'some people in line at a small stand'. Count the number of consonants in the given sentence.
Example Output: 17

Example Input: Sentence: 'there are two trains that are coming up the tracks together'. Count the number of consonants in the given sentence.
Example Output:
31