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

Example Input: Sentence: 'a pair of feet wearing slippers pointed at the floor'. How many words contain the letter 'e' in the sentence.
Example Output: 5

Example Input: Sentence: 'some soldiers cutting into a big sheet cake on a table'. How many words contain the letter 'c' in the sentence.
Example Output: 2

Example Input: Sentence: 'a bus is empty because all of the passengers just got off board'. How many words contain the letter 'i' in the sentence.
Example Output:
1