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

Ex Input:
Sentence: 'a giraffe walking in the grass near a building'. How many words contain the letter 'd' in the sentence.

Ex Output:
1

Ex Input:
Sentence: 'a little boy learning to throw a frisbee'. How many words contain the letter 'h' in the sentence.

Ex Output:
1

Ex Input:
Sentence: 'an open sandwich with onions on a small plate'. How many words contain the letter 'x' in the sentence.

Ex Output:
0