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 sink and a stove in a small kitchen'. Count the number of vowels in the given sentence.
Example Output: 11

Example Input: Sentence: 'a woman laying on some baggage resting on the floor'. Count the number of vowels in the given sentence.
Example Output: 17

Example Input: Sentence: 'a steam train is going down the train tracks'. Count the number of vowels in the given sentence.
Example Output:
13