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 person with a umbrella on a train track'. Count the number of vowels in the given sentence.
Example Output: 13

Example Input: Sentence: 'this is a group of boys with their boards'. Count the number of vowels in the given sentence.
Example Output: 12

Example Input: Sentence: 'a dog that is laying down under a bench'. Count the number of vowels in the given sentence.
Example Output:
11