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

[EX Q]: Sentence: 'a man walking in front of a train station'. How many words contain the letter 'o' in the sentence.
[EX A]: 3

[EX Q]: Sentence: 'a bunch of white hyacinths arranged in a vase'. How many words contain the letter 'r' in the sentence.
[EX A]: 1

[EX Q]: Sentence: 'two teams in the middle of playing a ruby game'. How many words contain the letter 'o' in the sentence.
[EX A]:
2