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 young boy in stripped shirt holding bottle'. Count the number of vowels in the given sentence.
Example Output: 12

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: 'a street sign on a dirt road with a sky background'. Count the number of vowels in the given sentence.
Example Output:
14