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

Input: Consider Input: Sentence: 'some people at a table with food and drinks'. How many words contain the letter 'n' in the sentence.

Output: 2


Input: Consider Input: Sentence: 'a white cat sitting on a couch in a den'. How many words contain the letter 'l' in the sentence.

Output: 0


Input: Consider Input: Sentence: 'a man is holding a surf board on the rock sand'. How many words contain the letter 'r' in the sentence.


Output: 3