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

Ex Input:
Sentence: 'a mother zebra standing next to a baby zebra'. How many words contain the letter 'e' in the sentence.

Ex Output:
4


Ex Input:
Sentence: 'a little boy that is sitting near two birds'. How many words contain the letter 'm' in the sentence.

Ex Output:
0


Ex Input:
Sentence: 'a teddy bear on some sand on the shore'. How many words contain the letter 'a' in the sentence.

Ex Output:

3