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

Ex Input:
Sentence: 'the laptop is disassembled with the parts piled on the outer shell'. How many words contain the letter 'v' in the sentence.

Ex Output:
0


Ex Input:
Sentence: 'a woman riding a motorcycle down a busy city street'. How many words contain the letter 'w' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'airliner approaching airport for landing on cloudy day'. How many words contain the letter 'n' in the sentence.

Ex Output:

4