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

Example Input: Sentence: 'a tree by a house has a traffic sign attached to it'. How many words contain the letter 'm' in the sentence.
Example Output: 0

Example Input: Sentence: 'a smiling man holds out a card with color swatches'. How many words contain the letter 'i' in the sentence.
Example Output: 2

Example Input: Sentence: 'a truck parked next to a small home and a green grass covered hill'. How many words contain the letter 'k' in the sentence.
Example Output:
2