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

[Q]: Sentence: 'a large airplane flying over a dry grass hillside'. How many words contain the letter 'e' in the sentence.
[A]: 4

[Q]: Sentence: 'some zebras dirt plants and bushes'. How many words contain the letter 'r' in the sentence.
[A]: 2

[Q]: Sentence: 'a sign show that there is danger ahead'. How many words contain the letter 'a' in the sentence.
[A]:
4