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: 'the corner of a bathroom with washrags and cleaning supplies'. How many words contain the letter 'q' in the sentence.

Ex Output:
0


Ex Input:
Sentence: 'a close up of a polar bear in a body of water'. How many words contain the letter 'r' in the sentence.

Ex Output:

3