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

Example Input: Sentence: 'a man in a tie that is looking to the side'. How many words contain the letter 'm' in the sentence.
Example Output: 1

Example Input: Sentence: 'several people and a dog riding on a small boat'. How many words contain the letter 'l' in the sentence.
Example Output: 3

Example Input: Sentence: 'a motorcycle is loaded into a tow truck'. How many words contain the letter 'k' in the sentence.
Example Output:
1