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: 'elephant herd, in a line, walking across savanna'. Count the number of vowels in the given sentence.
Example Output: 15

Example Input: Sentence: 'two males are seen on the field playing with a frisbee'. Count the number of vowels in the given sentence.
Example Output: 18

Example Input: Sentence: 'two buses side by side while entering an intersection'. Count the number of vowels in the given sentence.
Example Output:
18