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

Ex Input:
Sentence: 'a laptop a table a mouse some dirt and water'. How many words contain the letter 'u' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'there is a person awaiting to cross this street'. How many words contain the letter 'a' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'a cat that is sitting on some books'. How many words contain the letter 'j' in the sentence.

Ex Output:

0