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

Example Input: Sentence: 'a big building with a clock built into the top'. Count the number of vowels in the given sentence.
Example Output: 14

Example Input: Sentence: 'a man talking on a phone while standing in front of a toilet'. Count the number of vowels in the given sentence.
Example Output:
19