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 street is packed with people walking; many have umbrellas open'. Count the number of consonants in the given sentence.

SOLUTION: 33

PROBLEM: Sentence: 'a group of people are gathered around a running fire hydrant'. Count the number of consonants in the given sentence.

SOLUTION: 29

PROBLEM: Sentence: 'spotted cow out in the field eating grass'. Count the number of vowels in the given sentence.

SOLUTION:
13