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: 'two guys talking on their cell phones while drinking'. Count the number of vowels in the given sentence.
Example Output: 14

Example Input: Sentence: 'a big pile of pizzas that are in pans'. Count the number of vowels in the given sentence.
Example Output: 12

Example Input: Sentence: 'a stop sign in front of a cobblestone wall'. Count the number of vowels in the given sentence.
Example Output:
12

