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

Example Input: Sentence: 'people walking down the sidewalk with no turn signs'. How many words contain the letter 'e' in the sentence.
Example Output: 3

Example Input: Sentence: 'two giraffes with their heads in the tree'. How many words contain the letter 'o' in the sentence.
Example Output: 1

Example Input: Sentence: 'a group of people riding down the street'. How many words contain the letter 'i' in the sentence.
Example Output:
1