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

Input: Consider Input: Sentence: 'there are some warning signs on a public toilet'. How many words contain the letter 'a' in the sentence.

Output: 3

Input: Consider Input: Sentence: 'people fly kites and relax at a crowded sunlit beach'. How many words contain the letter 'l' in the sentence.

Output: 4

Input: Consider Input: Sentence: 'there are two motorcycles that are parked on a road way on a hill'. How many words contain the letter 'i' in the sentence.
Output: 1