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

Ex Input:
Sentence: 'a street scene with cars and an city bus'. How many words contain the letter 's' in the sentence.

Ex Output:
4


Ex Input:
Sentence: 'a man holding a tennis racquet on a tennis court'. How many words contain the letter 'w' in the sentence.

Ex Output:
0


Ex Input:
Sentence: 'a park is full of patrons on a fall day'. How many words contain the letter 'r' in the sentence.

Ex Output:

2