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

Ex Input:
Sentence: 'a dog on a deck ripping in to a plastic frisbee'. How many words contain the letter 'l' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a train that is pulling into the station'. How many words contain the letter 't' in the sentence.

Ex Output:
5


Ex Input:
Sentence: 'an image of a man in the kitchen holding a cupcake'. How many words contain the letter 'c' in the sentence.

Ex Output:

2