TASK DEFINITION: In this task, you need to count the number of words in a sentence that contain the given letter
PROBLEM: Sentence: 'a child on the sand and a boat and some water'. How many words contain the letter 's' in the sentence.

SOLUTION: 2

PROBLEM: Sentence: 'people standing in a river surrounding an elephant some are touching it'. How many words contain the letter 'd' in the sentence.

SOLUTION: 2

PROBLEM: Sentence: 'a group of fruit that are hanging from string'. How many words contain the letter 'r' in the sentence.

SOLUTION:
5