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

Example Input: Sentence: 'a group of bears sitting next to each other on a sidewalk'. How many words contain the letter 't' in the sentence.
Example Output: 4

Example Input: Sentence: 'the view from the top of a ski slope'. How many words contain the letter 'r' in the sentence.
Example Output: 1

Example Input: Sentence: 'the brown dog is waiting for his owner to play frisbee'. How many words contain the letter 'f' in the sentence.
Example Output:
2