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

Ex Input:
Sentence: 'a plate has many different types of food on it'. How many words contain the letter 'r' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'two males and a drink a laptop and a cellphone'. How many words contain the letter 'b' in the sentence.

Ex Output:
0


Ex Input:
Sentence: 'a white dog is on top of a bed looking into a box'. How many words contain the letter 'b' in the sentence.

Ex Output:

2