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: 'people stand and sit in a square in a european city'. Count the number of vowels in the given sentence.
Example Output: 19

Example Input: Sentence: 'girl with braids reading next to a cat laying on a bed'. Count the number of vowels in the given sentence.
Example Output: 16

Example Input: Sentence: 'a man riding a wave on a surfboard'. Count the number of vowels in the given sentence.
Example Output:
12