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

Input: Consider Input: Sentence: 'a fire hydrant on the side of the road near a building'. How many words contain the letter 'a' in the sentence.

Output: 5


Input: Consider Input: Sentence: 'a black sign that is standing in the grass'. How many words contain the letter 'f' in the sentence.

Output: 0


Input: Consider Input: Sentence: 'two small black bears being held by a volunteer at an animal shelter'. How many words contain the letter 'b' in the sentence.


Output: 4