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.

Sentence: 'two guys talking on their cell phones while drinking'. Count the number of vowels in the given sentence.
14

Sentence: 'hot pizza, ready to be sliced and eaten, sitting in the middle of a large table'. Count the number of vowels in the given sentence.
25

Sentence: 'several giraffes walk around a fenced-in area on the grass'. Count the number of vowels in the given sentence.

20