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

Sentence: 'a green and white street sign on a pole and a light'. How many words contain the letter 's' in the sentence.
2

Sentence: 'a bus station full of people walking on the side walk'. How many words contain the letter 'q' in the sentence.
0

Sentence: 'a red and yellow train at a platform'. How many words contain the letter 'p' in the sentence.
1