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 pizza sitting on top of a black cutting board'. How many words contain the letter 'g' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'the young lady tennis player is holding a racket'. How many words contain the letter 'a' in the sentence.

Ex Output:

4