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

[EX Q]: Sentence: 'an image of a man with a tennis racket in hand'. How many words contain the letter 'u' in the sentence.
[EX A]: 0

[EX Q]: Sentence: 'a teenager and child are fighting for a frisbee'. How many words contain the letter 'm' in the sentence.
[EX A]: 0

[EX Q]: Sentence: 'a giraffe who has walked away from the herd to get a drink of water'. How many words contain the letter 'r' in the sentence.
[EX A]:
5