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

Ex Input:
Sentence: 'a man on a boat pets a dog in a life jacket'. How many words contain the letter 'b' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a large field is next to a river'. How many words contain the letter 'j' in the sentence.

Ex Output:
0


Ex Input:
Sentence: 'a row of glassware is sitting on top of the table'. How many words contain the letter 'n' in the sentence.

Ex Output:

2