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: 'an older man smiles while picking green bananas'. Count the number of vowels in the given sentence.

SOLUTION: 15

PROBLEM: Sentence: 'people of various ages play tennis, hold tennis balls and swing their racquets'. Count the number of consonants in the given sentence.

SOLUTION: 41

PROBLEM: Sentence: 'a large air-force plant sitting on a dirt field'. Count the number of vowels in the given sentence.

SOLUTION:
15