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

Example Input: Sentence: 'an old motorcycle with the seat missing parked in a garage with other parts and motorcycles'. How many words contain the letter 'r' in the sentence.
Example Output: 6

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: 'the skiers with numbers on their shirts are carrying skis and snowboards'. How many words contain the letter 'i' in the sentence.
Example Output:
6