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

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


Input: Consider Input: Sentence: 'a rack full of clothes in a small bedroom'. How many words contain the letter 'o' in the sentence.

Output: 3


Input: Consider Input: Sentence: 'a stainless steel oven and gas range in a kitchen'. How many words contain the letter 'v' in the sentence.


Output: 1