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: 'a double-decker red bus on a london street'. Count the number of vowels in the given sentence.

SOLUTION: 14

PROBLEM: Sentence: 'close up of a giraffe eating leaves from a tree top'. Count the number of vowels in the given sentence.

SOLUTION: 19

PROBLEM: Sentence: 'a person by a fence with some animals'. Count the number of vowels in the given sentence.

SOLUTION:
12