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

Ex Input:
Sentence: 'a dog lying down with a blanket on top of it'. How many words contain the letter 'o' in the sentence.

Ex Output:
5

Ex Input:
Sentence: 'individuals are up and doing something fun today'. How many words contain the letter 'p' in the sentence.

Ex Output:
1

Ex Input:
Sentence: 'a close up of a one way sign with trees in the background'. How many words contain the letter 'o' in the sentence.

Ex Output:
4