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

Ex Input:
Sentence: 'a modern looking bathroom has a toilet and a sink'. How many words contain the letter 'o' in the sentence.

Ex Output:
4


Ex Input:
Sentence: 'a green blue and yellow boat sitting in a harbor'. How many words contain the letter 'o' in the sentence.

Ex Output:
3


Ex Input:
Sentence: 'a person jumping a skate board in the air'. How many words contain the letter 'r' in the sentence.

Ex Output:

3