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: 'a giraffe walking in its natural habitat on the savannah'. Replace the letter 't' with 'u' in the sentence.

SOLUTION: a giraffe walking in ius nauural habiuau on uhe savannah

PROBLEM: Sentence: 'boy in swimsuit on a beach throwing a frisbee'. Replace the letter 'i' with 'b' in the sentence.

SOLUTION:
boy bn swbmsubt on a beach throwbng a frbsbee