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 couple of giraffes are standing in a grassy field'. Count the number of consonants in the given sentence.

SOLUTION: 25

PROBLEM: Sentence: 'an large train pulling many cars of green containers'. Count the number of vowels in the given sentence.

SOLUTION: 16

PROBLEM: Sentence: 'a train goes down a track below a bridge'. Count the number of vowels in the given sentence.

SOLUTION:
13