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

Input: Consider Input: Sentence: 'a man with a skateboard up in air at a skateboard park'. How many words contain the letter 's' in the sentence.

Output: 2


Input: Consider Input: Sentence: 'a construction worker smashes away at the roof of a building'. How many words contain the letter 'b' in the sentence.

Output: 1


Input: Consider Input: Sentence: 'a dog jumping to catch a frisbee on a public lawn'. How many words contain the letter 'k' in the sentence.


Output: 0