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

Ex Input:
Sentence: 'three birds perched on top of a wire fence'. How many words contain the letter 'b' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a bird is standing on the edge of a book'. How many words contain the letter 'o' in the sentence.

Ex Output:
3


Ex Input:
Sentence: 'a black and white bird flying over brown water'. How many words contain the letter 'g' in the sentence.

Ex Output:

1