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

Input: Consider Input: Sentence: 'a young person flying through the air while riding a skateboard'. How many words contain the letter 'd' in the sentence.

Output: 2


Input: Consider Input: Sentence: 'a couple sitting on seats on a train'. How many words contain the letter 'z' in the sentence.

Output: 0


Input: Consider Input: Sentence: 'cars traveling on a busy road in asia'. How many words contain the letter 'k' in the sentence.


Output: 0