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: 'two men and two men having drinks at a bar'. How many words contain the letter 'g' in the sentence.

Ex Output:
1

Ex Input:
Sentence: 'a group of zebras that is standing in the grass'. How many words contain the letter 'l' in the sentence.

Ex Output:
0