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

Input: Consider Input: Sentence: 'a skier posing for a photo in front of a slope'. How many words contain the letter 'a' in the sentence.

Output: 3


Input: Consider Input: Sentence: 'three children standing behind a little girl with a bat in her hands'. How many words contain the letter 'c' in the sentence.

Output: 1


Input: Consider Input: Sentence: 'a white and orange plane in runway with trees in the background'. How many words contain the letter 'b' in the sentence.


Output: 1