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: 'a big sign that is lit up near some buildings'. How many words contain the letter 'r' in the sentence.

Output: 1


Input: Consider Input: Sentence: 'a man holding a cellphone up to a camera'. How many words contain the letter 'u' in the sentence.


Output: 1