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

Example Input: Sentence: 'an old photo of a car parked on the beach with a flag flying'. Count the number of vowels in the given sentence.
Example Output: 17

Example Input: Sentence: 'two sandwiches sitting on top of a white plate'. Count the number of consonants in the given sentence.
Example Output:
24