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

Ex Input:
Sentence: 'a person in the air on skis on a mountain slope'. How many words contain the letter 'w' in the sentence.

Ex Output:
0


Ex Input:
Sentence: 'a boy is doing a trick with his skateboard'. How many words contain the letter 'y' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a cat sitting on the floor watching the tv'. How many words contain the letter 'u' in the sentence.

Ex Output:

0