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: '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: 'a man standing on the side of a bicycle'. Count the number of consonants in the given sentence.
Example Output: 19

Example Input: Sentence: 'a group of people riding skis and snowboards'. Count the number of vowels in the given sentence.
Example Output:
14