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 group of men are watching two men shake hands over a table decorated with american and chinese flags'. Count the number of consonants in the given sentence.
Example Output: 51

Example Input: Sentence: 'an umbrella is displayed along with several other personal items'. Count the number of consonants in the given sentence.
Example Output: 34

Example Input: Sentence: 'a surfer in a wetsuit in the curl of a wave'. Count the number of vowels in the given sentence.
Example Output:
15