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

Input: Consider Input: Sentence: 'a airplane that has a propeller on the wing'. How many words contain the letter 'z' in the sentence.

Output: 0


Input: Consider Input: Sentence: 'the train needs to be serviced so it is o the truck'. How many words contain the letter 'n' in the sentence.

Output: 2


Input: Consider Input: Sentence: 'a blue and white flat faced truck with out a bed'. How many words contain the letter 'k' in the sentence.


Output: 1