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 girl standing on a sidewalk holding an umbrella'. Count the number of consonants in the given sentence.
Example Output: 26

Example Input: Sentence: 'a white ferret laying its head on a remote control'. Count the number of consonants in the given sentence.
Example Output: 24

Example Input: Sentence: 'a big double decker bus is driving around outside'. Count the number of vowels in the given sentence.
Example Output:
18