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

[Q]: Sentence: 'there are some warning signs on a public toilet'. How many words contain the letter 'a' in the sentence.
[A]: 3


[Q]: Sentence: 'a white biplane on grassy area next to buildings'. How many words contain the letter 'g' in the sentence.
[A]: 2


[Q]: Sentence: 'a bathroom is in the process of being remodeled'. How many words contain the letter 'n' in the sentence.
[A]:
2