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

Input: Consider Input: Sentence: 'a pizza with sauce cheese and sausage sitting on a table'. How many words contain the letter 's' in the sentence.

Output: 4


Input: Consider Input: Sentence: 'a red car parked with a gas pump inserted into it'. How many words contain the letter 'l' in the sentence.

Output: 0


Input: Consider Input: Sentence: 'a tall clock tower sticking out of the roof of a building'. How many words contain the letter 'r' in the sentence.


Output: 2