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

[Q]: Sentence: 'ther e is a commuter train that is coming on the tracks'. How many words contain the letter 'r' in the sentence.
[A]: 4

[Q]: Sentence: 'a fresh flower on a table in a piture of water'. How many words contain the letter 'n' in the sentence.
[A]: 2

[Q]: Sentence: 'people carrying blue surf boards down a bath to the beach'. How many words contain the letter 's' in the sentence.
[A]:
2