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

Ex Input:
Sentence: 'a bearded man sits on a couch with an electronic device in his hand'. How many words contain the letter 'e' in the sentence.

Ex Output:
3


Ex Input:
Sentence: 'a soldier holds something for a young bear'. How many words contain the letter 'a' in the sentence.

Ex Output:
3


Ex Input:
Sentence: 'a green traffic light shines above a street with light traffic'. How many words contain the letter 's' in the sentence.

Ex Output:

2