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

[EX Q]: Sentence: 'five sheep out in an open field eating straw'. How many words contain the letter 'd' in the sentence.
[EX A]: 1

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

[EX Q]: Sentence: 'a snowboarder holding a board while looking at the mountain'. How many words contain the letter 'r' in the sentence.
[EX A]:
2