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

Ex Input:
Sentence: 'a green and white street sign on a pole and a light'. How many words contain the letter 's' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'an orange cat laying on top of a wooden table'. How many words contain the letter 'l' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'a dog laying on top of a hard wood floor next to a wall'. How many words contain the letter 'k' in the sentence.

Ex Output:

0