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

[Q]: Sentence: 'a mother and son holding wii controls in front of a christmas fireplace'. How many words contain the letter 'x' in the sentence.
[A]: 0


[Q]: Sentence: 'the zebra is showing his rear end to the camera'. How many words contain the letter 'r' in the sentence.
[A]: 3


[Q]: Sentence: 'a red double decker bus is parked near the curb'. How many words contain the letter 'z' in the sentence.
[A]:
0