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 group of people are attending a wedding'. Count the number of vowels in the given sentence.
Example Output: 15

Example Input: Sentence: 'the baby is sitting by the window with a book'. Count the number of consonants in the given sentence.
Example Output: 24

Example Input: Sentence: 'this welcome sign is hanging near a traffic light'. Count the number of consonants in the given sentence.
Example Output:
27