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

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: 'a man in a helmet leans on his motorcycle'. How many words contain the letter 'n' in the sentence.

Ex Output:
4


Ex Input:
Sentence: 'two people standing close to one another playing nintendo wii'. How many words contain the letter 'e' in the sentence.

Ex Output:

5