TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'a family opens gifts in a room with their dog, while sitting on couches'. Replace the letter 's' with 'l' in the sentence.

SOLUTION: a family openl giftl in a room with their dog, while litting on couchel

PROBLEM: Sentence: 'a giraffe looking over a fence and another reaching over the fence'. Replace the letter 'l' with 'h' in the sentence.

SOLUTION: a giraffe hooking over a fence and another reaching over the fence

PROBLEM: Sentence: 'a young boy in a shopping cart looking at tooth brushes'. Replace the letter 'o' with 'r' in the sentence.

SOLUTION:
a yrung bry in a shrpping cart lrrking at trrth brushes