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

Example Input: Sentence: 'a green blue and yellow boat sitting in a harbor'. How many words contain the letter 'o' in the sentence.
Example Output: 3

Example Input: Sentence: 'a apple that is sitting on top of a knife'. How many words contain the letter 'u' in the sentence.
Example Output: 0

Example Input: Sentence: 'a bathroom has a baby blue toilet and tile'. How many words contain the letter 'm' in the sentence.
Example Output:
1