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

[Q]: Sentence: 'there are some warning signs on a public toilet'. How many words contain the letter 'a' in the sentence.
[A]: 3

[Q]: Sentence: 'a couple of zebras are standing in a pin'. How many words contain the letter 'a' in the sentence.
[A]: 5

[Q]: Sentence: 'a very big bin displaying a bunch of oranges'. How many words contain the letter 'e' in the sentence.
[A]:
2