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

Ex Input:
Sentence: 'a dog lying down with a blanket on top of it'. How many words contain the letter 'o' in the sentence.

Ex Output:
5


Ex Input:
Sentence: 'a man with baskets of goods stands next to his bicycle'. How many words contain the letter 'r' in the sentence.

Ex Output:
0


Ex Input:
Sentence: 'two young children lying on a mattress on the floor'. How many words contain the letter 'd' in the sentence.

Ex Output:

1