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: 'this is a man using his phone and walking'. Count the number of consonants in the given sentence.
Example Output: 21

Example Input: Sentence: 'a neon sign on the wall for a hamburger restaurant'. Count the number of consonants in the given sentence.
Example Output: 25

Example Input: Sentence: 'a dog with long floppy ears is looking out of a window'. Count the number of consonants in the given sentence.
Example Output:
26