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

Ex Input:
Sentence: 'some brown and white goats and a man on some grass'. How many words contain the letter 'o' in the sentence.

Ex Output:
5

Ex Input:
Sentence: 'a man buttering toast in his kitchen on the counter'. How many words contain the letter 'c' in the sentence.

Ex Output:
2

Ex Input:
Sentence: 'a bathroom with a toilet with a wooden seat top'. How many words contain the letter 'w' in the sentence.

Ex Output:
3