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: 'the sandwiches on the picnic blanket are cut in half'. Count the number of vowels in the given sentence.
Example Output: 15

Example Input: Sentence: 'a double-decker red bus on a london street'. Count the number of vowels in the given sentence.
Example Output: 14

Example Input: Sentence: 'a herd of zebras in a fenced in field'. Count the number of consonants in the given sentence.
Example Output:
17