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

Ex Input:
Sentence: 'a stop sign casting a shadow of a sign that says war'. How many words contain the letter 'y' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a boy in a car on a laptop'. How many words contain the letter 'j' in the sentence.

Ex Output:
0


Ex Input:
Sentence: 'two trains passing each other on train tracks'. How many words contain the letter 'k' in the sentence.

Ex Output:

1