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

Ex Input:
Sentence: 'a dog jumping up and catching a frisbee in its mouth'. How many words contain the letter 'r' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'people walking down the sidewalk with no turn signs'. How many words contain the letter 'e' in the sentence.

Ex Output:
3


Ex Input:
Sentence: 'a small brown cat sitting on a column in a park'. How many words contain the letter 'j' in the sentence.

Ex Output:

0