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

Ex Input:
Sentence: 'a large brown dog with a white deflated ball in its mouth'. How many words contain the letter 'm' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'an individual poses for a picture beside a bright window'. How many words contain the letter 'y' in the sentence.

Ex Output:
0


Ex Input:
Sentence: 'a man srufing the waves on a board in front of 3 tall pillars'. How many words contain the letter 'n' in the sentence.

Ex Output:

5