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

Input: Consider Input: Sentence: 'a clock tower next to a building in a city'. How many words contain the letter 'a' in the sentence.

Output: 3


Input: Consider Input: Sentence: 'an elephant near a man sitting down'. How many words contain the letter 'y' in the sentence.

Output: 0


Input: Consider Input: Sentence: 'a group of people swimming in the ocean'. How many words contain the letter 'a' in the sentence.


Output: 2