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

Ex Input:
Sentence: 'a stop sign that has been spray painted'. How many words contain the letter 'o' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a black and white photo of a plane sitting on a runway'. How many words contain the letter 'b' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a red stop sign that is under two green street signs'. How many words contain the letter 't' in the sentence.

Ex Output:

4