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

Ex Input:
Sentence: 'a stop light that is out on a pole'. How many words contain the letter 'z' in the sentence.

Ex Output:
0

Ex Input:
Sentence: 'a young man dressed like a pirate on a skateboard'. How many words contain the letter 'a' in the sentence.

Ex Output:
6

Ex Input:
Sentence: 'two zebras stand by each other next to a tree in a grassland'. How many words contain the letter 'a' in the sentence.

Ex Output:
6