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

Sentence: 'a group of many horses going about in a grassy meadow'. How many words contain the letter 'f' in the sentence.
1

Sentence: 'a person that is playing a tennis game'. How many words contain the letter 'j' in the sentence.
0

Sentence: 'two trains sit side by side at a station'. How many words contain the letter 'a' in the sentence.

4