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.

Example Input: Sentence: 'a clear polka dotted umbrella attached to a pole'. Count the number of consonants in the given sentence.
Example Output: 23

Example Input: Sentence: 'a crowd of people at a festival type event in front of a clock tower'. Count the number of consonants in the given sentence.
Example Output: 33

Example Input: Sentence: 'a group of people walk past houses in a field'. Count the number of consonants in the given sentence.
Example Output:
20