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 large plane is flying in the sky'. Count the number of consonants in the given sentence.
Example Output: 18

Example Input: Sentence: 'a military grade jets flies through clear skies'. Count the number of vowels in the given sentence.
Example Output: 15

Example Input: Sentence: 'a pigeon perched on top of a street sign'. Count the number of vowels in the given sentence.
Example Output:
13