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

Ex Input:
Sentence: 'a man holding a racquet hits a tennis ball'. How many words contain the letter 'v' in the sentence.

Ex Output:
0

Ex Input:
Sentence: 'a blue traffic sign next to a parked car on a city street'. How many words contain the letter 'g' in the sentence.

Ex Output:
1

Ex Input:
Sentence: 'a stainless steel double door refrigerator with bottom drawer freezer'. How many words contain the letter 's' in the sentence.

Ex Output:
2