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

Sentence: 'martha stewart holding a fluffy siamese cat on her arms'. How many words contain the letter 'a' in the sentence.
6

Sentence: 'black and white photo of old man riding a motorcycle'. How many words contain the letter 'n' in the sentence.
3

Sentence: 'boats in the water at the end of a dock'. How many words contain the letter 'a' in the sentence.

4