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 kids are participating in a swim class'. How many words contain the letter 'l' in the sentence.

Output: 1

Input: Consider Input: Sentence: 'a man rides a black motorcycle around a curve'. How many words contain the letter 'y' in the sentence.

Output: 1

Input: Consider Input: Sentence: 'woman in yellow and black plaid ski suit standing with snow board'. How many words contain the letter 's' in the sentence.
Output: 4