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

Ex Input:
Sentence: 'two men are dancing in a parade with brown umbrellas'. How many words contain the letter 'r' in the sentence.

Ex Output:
4


Ex Input:
Sentence: 'a little girl sitting on the floor reading a book'. How many words contain the letter 'n' in the sentence.

Ex Output:
3


Ex Input:
Sentence: 'two people riding on the back of horses'. How many words contain the letter 'e' in the sentence.

Ex Output:

3