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

Ex Input:
Sentence: 'a skier posing for a photo in front of a slope'. How many words contain the letter 'a' in the sentence.

Ex Output:
3


Ex Input:
Sentence: 'a boy is doing a trick with his skateboard'. How many words contain the letter 'y' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a baseball player holding a bat standing next to home plate'. How many words contain the letter 'e' in the sentence.

Ex Output:

5