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

Ex Input:
Sentence: 'a girl at a lake is looking at sand inside of a frisbee'. How many words contain the letter 'u' in the sentence.

Ex Output:
0


Ex Input:
Sentence: 'a man and a woman stand under an umbrella'. How many words contain the letter 's' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a store on the corner of the street with people going past'. How many words contain the letter 'z' in the sentence.

Ex Output:

0