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

Ex Input:
Sentence: 'a blue and white fire hydrant and two cars parked across the street'. How many words contain the letter 'y' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a young man dressed like a pirate on a skateboard'. How many words contain the letter 'a' in the sentence.

Ex Output:
6


Ex Input:
Sentence: 'several boys sitting in chairs in suites in a row of people'. How many words contain the letter 's' in the sentence.

Ex Output:

5