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

Ex Input:
Sentence: 'a pair of feet wearing slippers pointed at the floor'. How many words contain the letter 'e' in the sentence.

Ex Output:
5


Ex Input:
Sentence: 'man holding remote control for video game system'. How many words contain the letter 'u' in the sentence.

Ex Output:
0


Ex Input:
Sentence: 'a man that is sitting at a table with a bowl'. How many words contain the letter 'k' in the sentence.

Ex Output:

0