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 on skis on a snowy slope'. How many words contain the letter 'w' in the sentence.

Output: 1


Input: Consider Input: Sentence: 'an over head view of people walking in a cramped area'. How many words contain the letter 'q' in the sentence.

Output: 0


Input: Consider Input: Sentence: 'four people sitting around a computer station talking'. How many words contain the letter 's' in the sentence.


Output: 2