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

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.
4

Sentence: 'a sign reading butt street on the corner of a building with a no parking sign below it'. How many words contain the letter 'h' in the sentence.
2

Sentence: 'a open white toilet in a small bathroom'. How many words contain the letter 's' in the sentence.

1