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: 'two people are standing next to a giraffe'. Count the number of vowels in the given sentence.
Example Output: 14

Example Input: Sentence: 'two women are talking while one is eating'. Count the number of vowels in the given sentence.
Example Output: 15

Example Input: Sentence: 'a man is holding bananas in a market'. Count the number of vowels in the given sentence.
Example Output:
12