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

Ex Input:
Sentence: 'a group of men sitting by tables working on laptops'. How many words contain the letter 'l' in the sentence.

Ex Output:
2

Ex Input:
Sentence: 'a large brown dog with a white deflated ball in its mouth'. How many words contain the letter 'm' in the sentence.

Ex Output:
1

Ex Input:
Sentence: 'a man begins his descent down a ski slope'. How many words contain the letter 'p' in the sentence.

Ex Output:
1