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: 'two people are standing next to a giraffe'. Count the number of vowels in the given sentence.
Example Output: 14

Example Input: Sentence: 'convention with people standing at table with refreshments'. Count the number of vowels in the given sentence.
Example Output: 17

Example Input: Sentence: 'many people walk along a street with many stores'. Count the number of vowels in the given sentence.
Example Output:
14