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 man that is skiing down a mountain'. Count the number of consonants in the given sentence.
Example Output: 17

Example Input: Sentence: 'a red and white no parking sign stands slanted near some trees'. Count the number of consonants in the given sentence.
Example Output: 33

Example Input: Sentence: 'the brown bear is standing on a trail in the woods'. Count the number of vowels in the given sentence.
Example Output:
15