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

Ex Input:
Sentence: 'a counter top that has many pots and ingredients on it'. How many words contain the letter 'b' in the sentence.

Ex Output:
0


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: 'a guy looking into an empty refrigerator'. How many words contain the letter 'n' in the sentence.

Ex Output:

3