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.

Ex Input:
Sentence: 'an old train next to some empty train tracks'. Count the number of vowels in the given sentence.

Ex Output:
12


Ex Input:
Sentence: 'a man sitting on a bench in front of a boat'. Count the number of vowels in the given sentence.

Ex Output:
13


Ex Input:
Sentence: 'a group of sheep gather around a bin to eat food'. Count the number of vowels in the given sentence.

Ex Output:

18