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

[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.
[A]: 4


[Q]: Sentence: 'a man and a woman stand under an umbrella'. How many words contain the letter 's' in the sentence.
[A]: 1


[Q]: Sentence: 'a close up of glasses of wine on a table'. How many words contain the letter 't' in the sentence.
[A]:
1