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 group of men sitting by tables working on laptops'. How many words contain the letter 'l' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'a team of six horses plow a field'. How many words contain the letter 'k' in the sentence.

Ex Output:

0