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

Ex Input:
Sentence: 'a cat that is laying down with a mouse on top of it'. How many words contain the letter 'm' in the sentence.

Ex Output:
1


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 standing in front of a laptop computer'. How many words contain the letter 'f' in the sentence.

Ex Output:

2