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

Ex Input:
Sentence: 'an image of a man with a tennis racket in hand'. How many words contain the letter 'u' in the sentence.

Ex Output:
0


Ex Input:
Sentence: 'a man on a boat pets a dog in a life jacket'. How many words contain the letter 'b' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a black stove top oven sitting in a  kitchen'. How many words contain the letter 'f' in the sentence.

Ex Output:

0