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

[Q]: Sentence: 'a commuter train near a platform with no one on it'. How many words contain the letter 'z' in the sentence.
[A]: 0


[Q]: Sentence: 'two giraffes with their heads in the tree'. How many words contain the letter 'o' in the sentence.
[A]: 1


[Q]: Sentence: 'a train station with a blue train at the station'. How many words contain the letter 'r' in the sentence.
[A]:
2