TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'a man is on a saddled horse with reins'. Replace the letter 's' with 'o' in the sentence.

SOLUTION: a man io on a oaddled horoe with reino

PROBLEM: Sentence: 'two cats sitting on an office chair next to a desk'. Replace the letter 's' with 'j' in the sentence.

SOLUTION: two catj jitting on an office chair next to a dejk

PROBLEM: Sentence: 'cats sleeping on top of a bed with blue and white striped blankets'. Replace the letter 'l' with 'n' in the sentence.

SOLUTION:
cats sneeping on top of a bed with bnue and white striped bnankets