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

Ex Input:
Sentence: 'black and white photograph of a man using a cell phone on the street'. How many words contain the letter 'r' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'a bed has an empty bag and folded laundry stacked on it'. How many words contain the letter 'm' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a man resting on a park bench with his foot up'. How many words contain the letter 'h' in the sentence.

Ex Output:

3