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

Ex Input:
Sentence: 'a couple of people that are on some skateboards'. How many words contain the letter 'o' in the sentence.

Ex Output:
6


Ex Input:
Sentence: 'a glass vase with clear glass marbles in it and purple flowers coming out of the vase'. How many words contain the letter 'd' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a very cute cat laying its head on a pair of shoes'. How many words contain the letter 'v' in the sentence.

Ex Output:

1