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

Example Input: Sentence: 'young girls with backpacks are standing near stairs that look to go to the subway'. How many words contain the letter 'r' in the sentence.
Example Output: 4

Example Input: Sentence: 'a young person flying through the air while riding a skateboard'. How many words contain the letter 'd' in the sentence.
Example Output: 2

Example Input: Sentence: 'a giraffe looking over a fence of an enclosure'. How many words contain the letter 't' in the sentence.
Example Output:
0