TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'a woman sitting on a wooden chair holding a cat'. Replace the letter 'n' with 'q' in the sentence.

SOLUTION: a womaq sittiqg oq a woodeq chair holdiqg a cat

PROBLEM: Sentence: 'a couple of giraffe standing next to each other in a forest'. Replace the letter 'a' with 'w' in the sentence.

SOLUTION: w couple of girwffe stwnding next to ewch other in w forest

PROBLEM: Sentence: 'a white cat is sitting next to a green plate with a half of sandwich'. Replace the letter 'n' with 'd' in the sentence.

SOLUTION:
a white cat is sittidg dext to a greed plate with a half of saddwich