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

Ex Input:
Sentence: 'skate boarder trying to maintain his balance during stunt'. How many words contain the letter 'w' in the sentence.

Ex Output:
0


Ex Input:
Sentence: 'a man riding waves on his surfboard in the ocean'. How many words contain the letter 'v' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a airplane landing on a runway surrounded by post lights'. How many words contain the letter 'p' in the sentence.

Ex Output:

2