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

Example Input: Sentence: 'people in different boats rowing around a lake'. How many words contain the letter 'b' in the sentence.
Example Output: 1

Example Input: Sentence: 'a group of giraffes walk across an open area'. How many words contain the letter 'm' in the sentence.
Example Output: 0

Example Input: Sentence: 'there is a close up picture of a elephant standing up'. How many words contain the letter 'y' in the sentence.
Example Output:
0