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

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: 'the young giraffe is standing near the fence'. How many words contain the letter 's' in the sentence.

Output: 2

Input: Consider Input: Sentence: 'a bunch of buildings sit next to a street sign'. How many words contain the letter 'o' in the sentence.
Output: 2