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

Input: Consider Input: Sentence: 'a woman is hitting a tennis ball with her racket'. How many words contain the letter 'c' in the sentence.

Output: 1

Input: Consider Input: Sentence: 'a ram standing still in an empty pasture'. How many words contain the letter 'x' in the sentence.

Output: 0

Input: Consider Input: Sentence: 'people are sitting on a lawn and watching kites being flown in the sky'. How many words contain the letter 'c' in the sentence.
Output: 1