TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'two children struggle over a bat in their playroom'. Replace the letter 't' with 'v' in the sentence.

SOLUTION: vwo children svruggle over a bav in vheir playroom

PROBLEM: Sentence: 'a man that is on the back of an elephant'. Replace the letter 'c' with 'd' in the sentence.

SOLUTION: a man that is on the badk of an elephant

PROBLEM: Sentence: 'a small bird perched on some thin branches'. Replace the letter 'a' with 'f' in the sentence.

SOLUTION:
f smfll bird perched on some thin brfnches