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

Ex Input:
Sentence: 'a clothing line with teddy bears hung by their ears'. How many words contain the letter 'n' in the sentence.

Ex Output:
3


Ex Input:
Sentence: 'a woman sitting on top of a cement bench near a lake'. How many words contain the letter 'w' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a picture of the top of a building'. How many words contain the letter 'i' in the sentence.

Ex Output:

2