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

Ex Input:
Sentence: 'a person in the air with a skateboard upside down underneath'. How many words contain the letter 'i' in the sentence.

Ex Output:
4

Ex Input:
Sentence: 'he wants everyone to know that he has serious intentions for the tennis game'. How many words contain the letter 'h' in the sentence.

Ex Output:
5

Ex Input:
Sentence: 'a table with a computer yarn a glass and several other objects'. How many words contain the letter 'x' in the sentence.

Ex Output:
0