TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'a computer, keyboard, and mouse sitting on a desk'. Replace the letter 's' with 'c' in the sentence.

SOLUTION: a computer, keyboard, and mouce citting on a deck

PROBLEM: Sentence: 'two giraffe standing in an enclosure at the zoo next to a  tree'. Replace the letter 'n' with 'g' in the sentence.

SOLUTION: two giraffe stagdigg ig ag egclosure at the zoo gext to a  tree

PROBLEM: Sentence: 'a woman is ready to swing at a tennis ball'. Replace the letter 'i' with 'x' in the sentence.

SOLUTION:
a woman xs ready to swxng at a tennxs ball