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

Ex Input:
Sentence: 'a airplane that has a propeller on the wing'. How many words contain the letter 'z' in the sentence.

Ex Output:
0


Ex Input:
Sentence: 'people are parked along side the road by pay here signs'. How many words contain the letter 'a' in the sentence.

Ex Output:
5


Ex Input:
Sentence: 'a bird stands on a rock gazing out over the water'. How many words contain the letter 'f' in the sentence.

Ex Output:

0