TASK DEFINITION: In this task, you need to count the number of words in a sentence that contain the given letter
PROBLEM: Sentence: 'a man walking in front of a train station'. How many words contain the letter 'o' in the sentence.

SOLUTION: 3

PROBLEM: Sentence: 'a boy is doing a trick with his skateboard'. How many words contain the letter 'y' in the sentence.

SOLUTION: 1

PROBLEM: Sentence: 'a couple of knights riding horses on a green ground'. How many words contain the letter 'k' in the sentence.

SOLUTION:
1