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

Ex Input:
Sentence: 'a gray cat is wearing a santa hat'. How many words contain the letter 'm' in the sentence.

Ex Output:
0

Ex Input:
Sentence: 'a large clock tower under a grey cloudy sky'. How many words contain the letter 'l' in the sentence.

Ex Output:
3

Ex Input:
Sentence: 'a cowboy rides a horse down a city street'. How many words contain the letter 'p' in the sentence.

Ex Output:
0