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

Ex Input:
Sentence: 'a young man attempting to fly a kite on a forest hillside'. How many words contain the letter 'f' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'a tv showing a broadcast from the weather channel'. How many words contain the letter 'j' in the sentence.

Ex Output:
0


Ex Input:
Sentence: 'a doubles tennis match played in an indoor arena'. How many words contain the letter 'a' in the sentence.

Ex Output:

5