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

Ex Input:
Sentence: 'a bus station full of people walking on the side walk'. How many words contain the letter 'q' in the sentence.

Ex Output:
0

Ex Input:
Sentence: 'a keyboard on a table with a toothbrush a book some sunglasses and coffee'. How many words contain the letter 'e' in the sentence.

Ex Output:
5

Ex Input:
Sentence: 'a man riding an elephant in the river'. How many words contain the letter 'a' in the sentence.

Ex Output:
4