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

Input: Consider Input: Sentence: 'dental personnel in dentist office standing in front of a computer screen'. How many words contain the letter 'w' in the sentence.

Output: 0


Input: Consider Input: Sentence: 'a white cat looking in a rectangular mirror in a female bedroom'. How many words contain the letter 'q' in the sentence.

Output: 0


Input: Consider Input: Sentence: 'a man riding an elephant in the river'. How many words contain the letter 'a' in the sentence.


Output: 4