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

Ex Input:
Sentence: 'a man that is sitting on a horse in the grass'. How many words contain the letter 'y' in the sentence.

Ex Output:
0


Ex Input:
Sentence: 'a group of people on skis on a snowy slope'. How many words contain the letter 'w' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a man and woman on their cell phones by an umbrella'. How many words contain the letter 'f' in the sentence.

Ex Output:

0