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

Ex Input:
Sentence: 'the black bears are together on the rocks eating outside'. How many words contain the letter 'y' in the sentence.

Ex Output:
0


Ex Input:
Sentence: 'a gothic tower features a clock near a river'. How many words contain the letter 'e' in the sentence.

Ex Output:
4


Ex Input:
Sentence: 'the young boy is learning how to waterski'. How many words contain the letter 'c' in the sentence.

Ex Output:

0