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

Ex Input:
Sentence: 'a cat lying on an open laptop that is on a bed'. How many words contain the letter 'y' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a gray cat is wearing a santa hat'. How many words contain the letter 'm' in the sentence.

Ex Output:
0


Ex Input:
Sentence: 'a person riding a snow board on the ground'. How many words contain the letter 'b' in the sentence.

Ex Output:

1