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

Example Input: Sentence: 'a man in a blue shirt and ear piece holds a clip board'. How many words contain the letter 'u' in the sentence.
Example Output: 1

Example Input: Sentence: 'a woman with a shopping bag talking on a cell phone'. How many words contain the letter 'e' in the sentence.
Example Output: 2

Example Input: Sentence: 'a girl using a cell phone while a cow lays in the field'. How many words contain the letter 'z' in the sentence.
Example Output:
0