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: 'the bird with purple feathers is sitting on a branch'. Count the number of consonants in the given sentence.
Example Output: 29

Example Input: Sentence: 'three people sitting on a park bench waving at camera'. Count the number of vowels in the given sentence.
Example Output: 17

Example Input: Sentence: 'a group of people walking horses through a field'. Count the number of vowels in the given sentence.
Example Output:
16