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 bunch of people walking near some tall steps'. Count the number of vowels in the given sentence.

SOLUTION: 14

PROBLEM: Sentence: 'a man and a woman with smiles behind tennis racquets'. Count the number of vowels in the given sentence.

SOLUTION: 16

PROBLEM: Sentence: 'a pickup truck sitting on the back of a train'. Count the number of vowels in the given sentence.

SOLUTION:
13