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

Input: Consider Input: Sentence: 'three birds perched on top of a wire fence'. How many words contain the letter 'b' in the sentence.

Output: 1

Input: Consider Input: Sentence: 'a woman with long red hair packing herself into a suitcase'. How many words contain the letter 'i' in the sentence.

Output: 5

Input: Consider Input: Sentence: 'the cat is lying on top of the books on the shelf'. How many words contain the letter 'g' in the sentence.
Output: 1