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

Ex Input:
Sentence: 'a biscuit that someone has taken a bite out of'. How many words contain the letter 'k' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a woman surfer is on an ocean wave'. How many words contain the letter 's' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'a women who is walking with a yellow umbrella'. How many words contain the letter 'x' in the sentence.

Ex Output:

0