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

Ex Input:
Sentence: 'an elephant stands in the grass near a tree'. How many words contain the letter 'c' in the sentence.

Ex Output:
0


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 man in a tie smiling with several wine glasses in front of him'. How many words contain the letter 'o' in the sentence.

Ex Output:

2