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: 'two guys talking on their cell phones while drinking'. Count the number of vowels in the given sentence.

SOLUTION: 14

PROBLEM: Sentence: 'a woman throws up the tennis ball to serve'. Count the number of vowels in the given sentence.

SOLUTION: 12

PROBLEM: Sentence: '2 beds in a hotel room with the windows open'. Count the number of vowels in the given sentence.

SOLUTION:
13