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 man sitting on a bench in front of a boat'. Count the number of vowels in the given sentence.
Example Output: 13

Example Input: Sentence: 'a cyclist squats beside a bull on a grassy hillside'. Count the number of vowels in the given sentence.
Example Output: 15

Example Input: Sentence: 'a group of people varied in ages are riding in a toy train'. Count the number of consonants in the given sentence.
Example Output:
24