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

Input: Consider Input: Sentence: 'a sign asking for witnesses is posted in front of a destroyed home'. How many words contain the letter 'y' 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: 'scissors sitting on top of cut up credit cards'. How many words contain the letter 'b' in the sentence.


Output: 0