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

[EX Q]: Sentence: 'a group of giraffes walk across an open area'. How many words contain the letter 'm' in the sentence.
[EX A]: 0

[EX Q]: 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.
[EX A]: 4

[EX Q]: Sentence: 'giraffe standing in open area near large treed area'. How many words contain the letter 'd' in the sentence.
[EX A]:
2