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: 'a herd of sheep walking across a green field'. Count the number of consonants in the given sentence.
22

Sentence: 'a train moving on a track during the day'. Count the number of consonants in the given sentence.
20

Sentence: 'a red stop sign sitting on the side of a road at night'. Count the number of consonants in the given sentence.

26