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

Input: Consider Input: Sentence: 'a lit street light next to a bar'. How many words contain the letter 'w' in the sentence.

Output: 0


Input: Consider Input: Sentence: 'a group of many horses going about in a grassy meadow'. How many words contain the letter 'f' in the sentence.

Output: 1


Input: Consider Input: Sentence: 'young girls with backpacks are standing near stairs that look to go to the subway'. How many words contain the letter 'r' in the sentence.


Output: 4