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

Ex Input:
Sentence: 'the facades of the buildings in the row are all the same'. How many words contain the letter 'f' in the sentence.

Ex Output:
2

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 small bird is standing on a rock'. How many words contain the letter 'j' in the sentence.

Ex Output:
0