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

Input: Consider Input: Sentence: 'a group of people skiing down a mountain slope'. How many words contain the letter 'e' in the sentence.

Output: 2


Input: Consider Input: Sentence: 'a man flying through the air while riding a snowboard'. How many words contain the letter 'x' in the sentence.

Output: 0


Input: Consider Input: Sentence: 'two bears in a waterfall one on top of falls and one on bottom of the falls'. How many words contain the letter 'x' in the sentence.


Output: 0