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

Input: Consider Input: Sentence: 'a skier skiing on the mountain with trees behind him'. How many words contain the letter 'z' in the sentence.

Output: 0


Input: Consider Input: Sentence: 'watchful raptor standing on one foot on a rock pile'. How many words contain the letter 'r' in the sentence.

Output: 2


Input: Consider Input: Sentence: 'four giraffes eating together on an open field'. How many words contain the letter 'k' in the sentence.


Output: 0