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: 'people of various ages play tennis, hold tennis balls and swing their racquets'. Count the number of consonants in the given sentence.
Example Output: 41

Example Input: Sentence: 'a cow crosses a stream while sun rays shine down on the water'. Count the number of vowels in the given sentence.
Example Output: 18

Example Input: Sentence: 'a fondant birthday cake with yarn and knitting needles'. Count the number of consonants in the given sentence.
Example Output:
31