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

Ex Input:
Sentence: 'a large dog curls up on the pillow on a bunk bed'. How many words contain the letter 't' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a carrot and celery are on a cutting board'. How many words contain the letter 's' in the sentence.

Ex Output:
0


Ex Input:
Sentence: 'a tennis player swings his racket at a tennis ball'. How many words contain the letter 's' in the sentence.

Ex Output:

4