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

Example Input: Sentence: 'a clock tower next to a building in a city'. How many words contain the letter 'a' in the sentence.
Example Output: 3

Example Input: Sentence: 'two men playing a video game inside of a room'. How many words contain the letter 'f' in the sentence.
Example Output: 1

Example Input: Sentence: 'a woman holds two umbrellas in her hands'. How many words contain the letter 'a' in the sentence.
Example Output:
4