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

Ex Input:
Sentence: 'a man standing in the ocean holding a surfboard'. How many words contain the letter 'c' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a man walking in front of a train station'. How many words contain the letter 'o' in the sentence.

Ex Output:
3


Ex Input:
Sentence: 'a stop sign on a pole on the side of the road'. How many words contain the letter 'k' in the sentence.

Ex Output:

0