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

[Q]: Sentence: 'a tree by a house has a traffic sign attached to it'. How many words contain the letter 'm' in the sentence.
[A]: 0


[Q]: Sentence: 'a bird is standing on the edge of a book'. How many words contain the letter 'o' in the sentence.
[A]: 3


[Q]: Sentence: 'steam locomotive pulling a long load of freight past a few bystanders'. How many words contain the letter 'r' in the sentence.
[A]:
2