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

Input: Consider Input: Sentence: 'a young girl plays tennis in a court with grass in the cracks'. How many words contain the letter 'w' in the sentence.

Output: 1


Input: Consider Input: Sentence: 'cows crowd up to a barbed wire fence under a tree'. How many words contain the letter 'n' in the sentence.

Output: 2


Input: Consider Input: Sentence: 'a child on the sand and a boat and some water'. How many words contain the letter 's' in the sentence.


Output: 2