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

Input: Consider Input: Sentence: 'a big sign that is lit up near some buildings'. How many words contain the letter 'r' in the sentence.

Output: 1

Input: Consider Input: Sentence: 'a view from inside a train cart going down a track'. How many words contain the letter 'e' in the sentence.

Output: 2

Input: Consider Input: Sentence: 'a police officer standing next to a no left turn sign'. How many words contain the letter 'o' in the sentence.
Output: 4