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

Ex Input:
Sentence: 'a man sits on a bench with a dog in lap reading'. How many words contain the letter 'x' in the sentence.

Ex Output:
0

Ex Input:
Sentence: 'a child on the sand and a boat and some water'. How many words contain the letter 's' in the sentence.

Ex Output:
2

Ex Input:
Sentence: 'a huge airplane preparing to take off and leave'. How many words contain the letter 'u' in the sentence.

Ex Output:
1