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

Example Input: Sentence: 'a couple of lambs that are in the dirt'. How many words contain the letter 'l' in the sentence.
Example Output: 2

Example Input: Sentence: 'a large truck driving on a crowded street'. How many words contain the letter 'i' in the sentence.
Example Output: 1

Example Input: Sentence: 'a bunch of white hyacinths arranged in a vase'. How many words contain the letter 'r' in the sentence.
Example Output:
1