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: 'a lighthouse with birds flying by it at a bay'. How many words contain the letter 'q' in the sentence.

Ex Output:
0


Ex Input:
Sentence: 'a man in a stadium standing next to stacks of chairs'. How many words contain the letter 'd' in the sentence.

Ex Output:

2