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

Ex Input:
Sentence: 'a little girl sitting on the floor reading a book'. How many words contain the letter 'n' in the sentence.

Ex Output:
3


Ex Input:
Sentence: 'a cat is walking on a wooden deck in the snow'. How many words contain the letter 'q' in the sentence.

Ex Output:
0


Ex Input:
Sentence: 'three blueandwhite ana all nippon airways airplanes at an airport'. How many words contain the letter 'x' in the sentence.

Ex Output:

0