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

Ex Input:
Sentence: 'a pair of tennis players on a tennis court'. How many words contain the letter 'u' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a green and white street sign on a pole and a light'. How many words contain the letter 's' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'a number of animals and small boats in a body of water'. How many words contain the letter 'f' in the sentence.

Ex Output:

2