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

[Q]: Sentence: 'black and white photograph of a man using a cell phone on the street'. How many words contain the letter 'r' in the sentence.
[A]: 2

[Q]: Sentence: 'two skiers standing side by side in the snow posing for a picture'. How many words contain the letter 'u' in the sentence.
[A]: 1

[Q]: Sentence: 'a metro liner with bicycles on the front going down the street'. How many words contain the letter 'd' in the sentence.
[A]:
1