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

Ex Input:
Sentence: 'this is a yellow train riding the rails'. How many words contain the letter 'n' in the sentence.

Ex Output:
2


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: 'some kids are all taking a photograph together'. How many words contain the letter 'e' in the sentence.

Ex Output:

3