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

Ex Input:
Sentence: 'the zebra is showing his rear end to the camera'. How many words contain the letter 'r' in the sentence.

Ex Output:
3


Ex Input:
Sentence: 'a woman in glasses and a black shirt next to clock'. How many words contain the letter 'q' in the sentence.

Ex Output:
0


Ex Input:
Sentence: 'a single giraffe standing in front of a few trees'. How many words contain the letter 'k' in the sentence.

Ex Output:

0