TASK DEFINITION: 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.
PROBLEM: Sentence: 'people stand and sit in a square in a european city'. Count the number of vowels in the given sentence.

SOLUTION: 19

PROBLEM: Sentence: 'a group of snowboarders in short sleeves on the slopes'. Count the number of consonants in the given sentence.

SOLUTION: 28

PROBLEM: Sentence: 'a cat sleeping on a bed next to a window in a room'. Count the number of consonants in the given sentence.

SOLUTION:
21