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

Example Input: Sentence: 'a giraffe that is eating some leaves from a tree'. How many words contain the letter 'g' in the sentence.
Example Output: 2

Example Input: Sentence: 'a line of portable toilets stands outdoors under trees'. How many words contain the letter 'l' in the sentence.
Example Output: 3

Example Input: Sentence: 'a little baby that is sitting with a toothbrush'. How many words contain the letter 'a' in the sentence.
Example Output:
4