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

Input: Consider Input: Sentence: 'a person that is flying a hamburger kite'. How many words contain the letter 'b' in the sentence.

Output: 1

Input: Consider Input: Sentence: 'a tennis player holds a ball as if to throw it in the air to serve it'. How many words contain the letter 'o' in the sentence.

Output: 4

Input: Consider Input: Sentence: 'a black and silver oil rigger and yellow car on road'. How many words contain the letter 'g' in the sentence.
Output: 1