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

Input: Consider Input: Sentence: 'a person in uniform is on a motorcycle near other uniformed people'. How many words contain the letter 'r' in the sentence.

Output: 6

Input: Consider Input: Sentence: 'a beautiful woman holding a pink frosted cake'. How many words contain the letter 'q' in the sentence.

Output: 0

Input: Consider Input: Sentence: 'a red and yellow train parked at a train station'. How many words contain the letter 's' in the sentence.
Output: 1