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 big building with a clock built into the top'. Count the number of vowels in the given sentence.
Example Output: 14

Example Input: Sentence: 'a living room filled with furniture and a small tv'. Count the number of vowels in the given sentence.
Example Output: 15

Example Input: Sentence: 'a street sign and a don't walk sign on a dark night'. Count the number of vowels in the given sentence.
Example Output:
13