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

Ex Input:
Sentence: 'martha stewart holding a fluffy siamese cat on her arms'. How many words contain the letter 'a' in the sentence.

Ex Output:
6


Ex Input:
Sentence: 'a woman carrying her surfboard to the ocean'. How many words contain the letter 'q' in the sentence.

Ex Output:
0


Ex Input:
Sentence: 'a wide ski slope with two lifts and a large crowd'. How many words contain the letter 'n' in the sentence.

Ex Output:

1