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

Ex Input:
Sentence: 'a couple of zebras are standing in a pin'. How many words contain the letter 'a' in the sentence.

Ex Output:
5


Ex Input:
Sentence: 'a red car parked with a gas pump inserted into it'. How many words contain the letter 'l' in the sentence.

Ex Output:
0


Ex Input:
Sentence: 'a line of motorcycles parked on a small street'. How many words contain the letter 'h' in the sentence.

Ex Output:

0