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

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 child on the sand and a boat and some water'. How many words contain the letter 's' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'a black and white photo of lots of sheep'. How many words contain the letter 'y' in the sentence.

Ex Output:

0