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

Example Input: Sentence: 'a skier skiing on the mountain with trees behind him'. How many words contain the letter 'z' in the sentence.
Example Output: 0

Example Input: Sentence: 'two men and two men having drinks at a bar'. How many words contain the letter 'g' in the sentence.
Example Output: 1

Example Input: Sentence: 'a man on the beach leaping for a frisbee'. How many words contain the letter 'b' in the sentence.
Example Output:
2