In this task, you need to count the number of words in a sentence that contain the given letter

Sentence: 'a skier posing for a photo in front of a slope'. How many words contain the letter 'a' in the sentence.
3

Sentence: 'a couple of horses standing next to each other on a field'. How many words contain the letter 'q' in the sentence.
0

Sentence: 'the backside of three elephants standing on the side of the road'. How many words contain the letter 'a' in the sentence.

4