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

Ex Input:
Sentence: 'a person that is wearing glasses looking into a mirror'. How many words contain the letter 'f' in the sentence.

Ex Output:
0


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: 'an image of a man that is on his laptop'. How many words contain the letter 's' in the sentence.

Ex Output:

2