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

Input: Consider Input: Sentence: 'a clock tower next to a building in a city'. How many words contain the letter 'a' in the sentence.

Output: 3

Input: Consider Input: Sentence: 'fresh daisies in a rectangular green glass vase'. How many words contain the letter 's' in the sentence.

Output: 4

Input: Consider Input: Sentence: 'a young girl setting on a concrete bench with a forest behind her'. How many words contain the letter 'z' in the sentence.
Output: 0