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

Input: Consider Input: Sentence: 'a pizza pie is on a wooden serving tray'. How many words contain the letter 's' in the sentence.

Output: 2

Input: Consider Input: Sentence: 'a man srufing the waves on a board in front of 3 tall pillars'. How many words contain the letter 'n' in the sentence.

Output: 5

Input: Consider Input: Sentence: 'a group of people are skiing while dressed in costumes'. How many words contain the letter 'x' in the sentence.
Output: 0