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 people dressed to ski standing in the snow'. How many words contain the letter 'b' in the sentence.
Example Output: 0

Example Input: Sentence: 'a road cut off by police barricade tape'. How many words contain the letter 'x' in the sentence.
Example Output: 0

Example Input: Sentence: 'six military planes that are flying in formation'. How many words contain the letter 'n' in the sentence.
Example Output:
4