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

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


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 small orange airplane is parked by a building'. How many words contain the letter 'i' in the sentence.

Ex Output:

3