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

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: 'antique fire truck restored and displayed at outdoor event'. How many words contain the letter 'x' in the sentence.

Ex Output:
0


Ex Input:
Sentence: 'young boy in baseball uniform posing in front of a baseball stadium'. How many words contain the letter 's' in the sentence.

Ex Output:

4