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

Ex Input:
Sentence: 'a large red sign on a metal pole'. How many words contain the letter 'q' in the sentence.

Ex Output:
0


Ex Input:
Sentence: 'an untidy room with clothes bottles next to an oven'. How many words contain the letter 'a' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'a man that is water skiing with a high field of grass behind him'. How many words contain the letter 's' in the sentence.

Ex Output:

3