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

Ex Input:
Sentence: 'a mother and son holding wii controls in front of a christmas fireplace'. How many words contain the letter 'x' in the sentence.

Ex Output:
0


Ex Input:
Sentence: 'a green and white street sign on a pole and a light'. How many words contain the letter 's' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'woman working in kitchen preparing food for party'. How many words contain the letter 'z' in the sentence.

Ex Output:

0