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

Ex Input:
Sentence: 'an old airplane sitting on top of a field'. How many words contain the letter 'h' in the sentence.

Ex Output:
0


Ex Input:
Sentence: 'a construction worker smashes away at the roof of a building'. How many words contain the letter 'b' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a sidewalk with a toilet laying on side with people in background'. How many words contain the letter 'o' in the sentence.

Ex Output:

4