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

Ex Input:
Sentence: 'a close up of a business sign on a building'. How many words contain the letter 'y' in the sentence.

Ex Output:
0


Ex Input:
Sentence: 'an untidy room with clothes bottles next to an oven'. How many words contain the letter 'a' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'a empty park bench that is near some flowers'. How many words contain the letter 'w' in the sentence.

Ex Output:

1