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

Input: Consider Input: Sentence: 'people are parked along side the road by pay here signs'. How many words contain the letter 'a' in the sentence.

Output: 5

Input: Consider Input: Sentence: 'a man holding an umbrella in one hand and a cell phone up to his ear in the other'. How many words contain the letter 'x' in the sentence.

Output: 0

Input: Consider Input: Sentence: 'a young child holding onto the wii controller and standing on a wii fitpad'. How many words contain the letter 'a' in the sentence.
Output: 5