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

Input: Consider Input: Sentence: 'a long train is coming down some tracks'. How many words contain the letter 'w' in the sentence.

Output: 1


Input: Consider Input: Sentence: 'a woman sitting in a chair next to a tea table in the woods'. How many words contain the letter 'i' in the sentence.

Output: 4


Input: Consider Input: Sentence: 'young skier posing for photo in alpine ski area'. How many words contain the letter 's' in the sentence.


Output: 3