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

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 man sanding next to a cow in a pen'. How many words contain the letter 'h' in the sentence.

Ex Output:
0


Ex Input:
Sentence: 'a close up of two black cows grazing the grass'. How many words contain the letter 'u' in the sentence.

Ex Output:

1