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 group of people standing around a tv'. Count the number of vowels in the given sentence.
Example Output: 13

Example Input: Sentence: 'many white birds flying above a river that flows in front of a forest'. Count the number of consonants in the given sentence.
Example Output: 37

Example Input: Sentence: 'a dog about to jump for a frisbee'. Count the number of consonants in the given sentence.
Example Output:
14