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

Sentence: 'a apple that is sitting on top of a knife'. How many words contain the letter 'u' in the sentence.
0

Sentence: 'a small terrier stands in the open suitcase ready to go'. How many words contain the letter 'l' in the sentence.
1

Sentence: 'a display of a sandwich and a pickle on a plate'. How many words contain the letter 'f' in the sentence.

1