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

[EX Q]: Sentence: 'a man in a helmet leans on his motorcycle'. How many words contain the letter 'n' in the sentence.
[EX A]: 4

[EX Q]: Sentence: 'a person in uniform is on a motorcycle near other uniformed people'. How many words contain the letter 'r' in the sentence.
[EX A]: 6

[EX Q]: Sentence: 'a crew of sea men commanding a boat from the command center'. How many words contain the letter 'f' in the sentence.
[EX A]:
2