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: 'some people are looking at two giraffes at a zoo'. Count the number of consonants in the given sentence.
Example Output: 20

Example Input: Sentence: 'a woman in a fur coat and green clothes playing nintendo wii'. Count the number of vowels in the given sentence.
Example Output: 20

Example Input: Sentence: 'a man sitting on the ground against a tree'. Count the number of vowels in the given sentence.
Example Output:
14