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

Ex Input:
Sentence: 'a box filled with fresh fruit and vegetables'. How many words contain the letter 'w' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a long train is coming down some tracks'. How many words contain the letter 'w' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a boy messily eating a powdered doughnut at a table'. How many words contain the letter 'n' in the sentence.

Ex Output:

2