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 black bear standing on the ground with grass'. Count the number of vowels in the given sentence.

SOLUTION: 12

PROBLEM: Sentence: 'a girl smiles while standing in front of a large target sign'. Count the number of consonants in the given sentence.

SOLUTION: 32

PROBLEM: Sentence: 'a red stop sign sitting under a couple of green street signs'. Count the number of vowels in the given sentence.

SOLUTION:
18