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

Input: Consider Input: Sentence: 'people standing in a river surrounding an elephant some are touching it'. How many words contain the letter 'd' in the sentence.

Output: 2


Input: Consider Input: Sentence: 'a man is water skiing in the ocean'. How many words contain the letter 'c' in the sentence.

Output: 1


Input: Consider Input: Sentence: 'two cars driving through and empty square in front of a building'. How many words contain the letter 'z' in the sentence.


Output: 0