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

Ex Input:
Sentence: 'a man on a motorcycle towing another man on a skateboard'. How many words contain the letter 'n' in the sentence.

Ex Output:
6


Ex Input:
Sentence: 'a sandwich shop with cars parked in front of it'. How many words contain the letter 'u' in the sentence.

Ex Output:
0


Ex Input:
Sentence: 'a park bench in a shabby looking area'. How many words contain the letter 'y' in the sentence.

Ex Output:

1