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: 'two traffic signs are pictured in front of a sky background'. Count the number of vowels in the given sentence.
Example Output: 16

Example Input: Sentence: 'the buses are waiting in line for pickup'. Count the number of consonants in the given sentence.
Example Output: 19

Example Input: Sentence: 'a bunch of kites that are being flown in the sky'. Count the number of consonants in the given sentence.
Example Output:
25