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

Ex Input:
Sentence: 'a person in a helmet riding a skateboard'. How many words contain the letter 'c' in the sentence.

Ex Output:
0

Ex Input:
Sentence: 'a dog jumping up and catching a frisbee in its mouth'. How many words contain the letter 'r' in the sentence.

Ex Output:
1

Ex Input:
Sentence: 'a man with a surfboard standing next to tree'. How many words contain the letter 'g' in the sentence.

Ex Output:
1