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 group of men are watching two men shake hands over a table decorated with american and chinese flags'. Count the number of consonants in the given sentence.
51

Sentence: 'pedestrians stand on the street between buildings in the city'. Count the number of consonants in the given sentence.
34

Sentence: 'a brown bear is walking through the field with her cubs'. Count the number of vowels in the given sentence.

15