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

Example Input: Sentence: 'the zebra is showing his rear end to the camera'. How many words contain the letter 'r' in the sentence.
Example Output: 3

Example Input: Sentence: 'a woman with a green umbrella crosses the wet street'. How many words contain the letter 'q' in the sentence.
Example Output: 0

Example Input: Sentence: 'a street sign has fallen down off of the poles'. How many words contain the letter 'x' in the sentence.
Example Output:
0