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 man on a green field throwing a baseball'. Count the number of vowels in the given sentence.

SOLUTION: 14

PROBLEM: Sentence: 'three black cows standing next to each other on a field'. Count the number of vowels in the given sentence.

SOLUTION: 16

PROBLEM: Sentence: 'a very cluttered chinese street showing many business signs'. Count the number of vowels in the given sentence.

SOLUTION:
17