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 pretty young lady greeting a zebra at a zoo'. Count the number of consonants in the given sentence.
Example Output: 21

Example Input: Sentence: 'a young skateboarder practices in a city skate park as others look on'. Count the number of consonants in the given sentence.
Example Output: 34

Example Input: Sentence: 'this is an image of a laptop computer'. Count the number of vowels in the given sentence.
Example Output:
13