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: 'the four airplanes are flying through the sky'. Count the number of consonants in the given sentence.
Example Output: 25

Example Input: Sentence: 'a person skiing down a steep snowy hill'. Count the number of vowels in the given sentence.
Example Output: 11

Example Input: Sentence: 'a group of men standing next to a truck unloading it'. Count the number of vowels in the given sentence.
Example Output:
16