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

Input: Consider Input: Sentence: 'an asian man ad woman on their cell phones'. How many words contain the letter 'i' in the sentence.

Output: 2


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 pretty wooden table with a big knife and food'. How many words contain the letter 'b' in the sentence.


Output: 2