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 mounted in the face of a building'. How many words contain the letter 'e' in the sentence.

Ex Output:
4


Ex Input:
Sentence: 'a young pitcher throws a ball on the pitchers mound while a man in red shirt looks at him'. How many words contain the letter 'z' in the sentence.

Ex Output:
0


Ex Input:
Sentence: 'a young child riding skis across snow covered ground'. How many words contain the letter 'f' in the sentence.

Ex Output:

0