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

Ex Input:
Sentence: 'two elephants in the water in front of a waterfall'. How many words contain the letter 'x' in the sentence.

Ex Output:
0


Ex Input:
Sentence: 'a young man dressed like a pirate on a skateboard'. How many words contain the letter 'a' in the sentence.

Ex Output:
6


Ex Input:
Sentence: 'three skiers some clouds and snow one skier has blue pants on'. How many words contain the letter 'z' in the sentence.

Ex Output:

0