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: 'an artistic vase with a depiction of an octopus on it'. Count the number of vowels in the given sentence.
19

Sentence: 'this is a group of boys with their boards'. Count the number of vowels in the given sentence.
12

Sentence: 'a man is holding up an old cellphone'. Count the number of consonants in the given sentence.

18