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

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 crowd of people flying kites near the capitol building'. How many words contain the letter 'a' in the sentence.

Ex Output:
3


Ex Input:
Sentence: 'a man holding a baseball bat in a baseball uniform'. How many words contain the letter 'n' in the sentence.

Ex Output:

4