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

Example Input: Sentence: 'zebra eating from the ground near a tree'. How many words contain the letter 'k' in the sentence.
Example Output: 0

Example Input: Sentence: 'a group of people on skis on a snowy slope'. How many words contain the letter 'w' in the sentence.
Example Output: 1

Example Input: Sentence: 'a lone skateboarder is riding down a street'. How many words contain the letter 'o' in the sentence.
Example Output:
3