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

Ex Input:
Sentence: 'a white biplane on grassy area next to buildings'. How many words contain the letter 'g' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'a young pitcher throws a ball on the pitchers mound while a man in red shirt looks at him'. How many words contain the letter 'z' in the sentence.

Ex Output:
0


Ex Input:
Sentence: 'a cat is laying in a piece of luggage'. How many words contain the letter 'p' in the sentence.

Ex Output:

1