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

Input: Consider Input: Sentence: 'a kitchen with a dining room table and a sitting area'. How many words contain the letter 'r' in the sentence.

Output: 2


Input: Consider Input: Sentence: 'unusual round vase with flower stems inside it'. How many words contain the letter 'c' in the sentence.

Output: 0


Input: Consider Input: Sentence: 'some fog traffic lights street lights and buildings'. How many words contain the letter 'b' in the sentence.


Output: 1