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

Ex Input:
Sentence: 'a group of people standing together talking '. How many words contain the letter 'b' in the sentence.

Ex Output:
0


Ex Input:
Sentence: 'a mirror above a bathroom sink next to a window'. How many words contain the letter 'v' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'some zebras are outside and walking down the grassland'. How many words contain the letter 'y' in the sentence.

Ex Output:

0