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

[Q]: Sentence: 'a smiling  woman wearing a hat holds up a snowboard'. How many words contain the letter 'b' in the sentence.
[A]: 1


[Q]: Sentence: 'black and white photo of old man riding a motorcycle'. How many words contain the letter 'n' in the sentence.
[A]: 3


[Q]: Sentence: 'a man sitting on a bench in a passenger train holding his luggage'. How many words contain the letter 'i' in the sentence.
[A]:
5