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: 'street signs are affixed to a utility pole'. How many words contain the letter 'u' in the sentence.

Output: 1


Input: Consider Input: Sentence: 'a man petting a cow on a farm yard'. How many words contain the letter 'o' in the sentence.


Output: 2