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

Example Input: Sentence: 'a woman standing in the dirt looking up at an elephant'. How many words contain the letter 'b' in the sentence.
Example Output: 0

Example Input: Sentence: 'two skiers standing side by side in the snow posing for a picture'. How many words contain the letter 'u' in the sentence.
Example Output: 1

Example Input: Sentence: 'an elephant walks toward the camera with other elephants nearby'. How many words contain the letter 'c' in the sentence.
Example Output:
1