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 bowl of broccoli and sausage with a side of beer'. Count the number of vowels in the given sentence.
Example Output: 18

Example Input: Sentence: 'an empty airport lobby with a tv and yellow chairs'. Count the number of vowels in the given sentence.
Example Output: 13

Example Input: Sentence: 'the sandwiches on the picnic blanket are cut in half'. Count the number of vowels in the given sentence.
Example Output:
15