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 and a woman sitting in the backseat as the woman talks on a cell phone'. How many words contain the letter 's' in the sentence.

SOLUTION: 4

PROBLEM: Sentence: 'man and woman wearing all red standing in a snowy field'. How many words contain the letter 'k' in the sentence.

SOLUTION: 0

PROBLEM: Sentence: 'a tall clock tower sticking out of the roof of a building'. How many words contain the letter 'r' in the sentence.

SOLUTION:
2