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 cnn anchor talking about racism on the air'. Count the number of vowels in the given sentence.
Example Output: 14

Example Input: Sentence: 'several softball players pause while onlookers chat together in a park'. Count the number of consonants in the given sentence.
Example Output: 37

Example Input: Sentence: 'there are two cars parked in this parking lot'. Count the number of vowels in the given sentence.
Example Output:
13