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 giraffes walk across an open area'. How many words contain the letter 'm' in the sentence.
Example Output: 0

Example Input: Sentence: 'adult men playing with flying disc at popular beach'. How many words contain the letter 'o' in the sentence.
Example Output: 1

Example Input: Sentence: 'a young man is swinging hard with a baseball bat'. How many words contain the letter 'u' in the sentence.
Example Output:
1