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

[EX Q]: Sentence: 'a man is sitting in a cubicle with a computer'. How many words contain the letter 'a' in the sentence.
[EX A]: 4

[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: 'handmade vases all the same size but all different colors'. How many words contain the letter 'w' in the sentence.
[EX A]:
0