TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'a male holding a baseball bat standing on a big white star'. Replace the letter 'a' with 'i' in the sentence.

SOLUTION: i mile holding i bisebill bit stinding on i big white stir

PROBLEM: Sentence: 'two men and a dog are standing beside a building'. Replace the letter 'b' with 'y' in the sentence.

SOLUTION: two men and a dog are standing yeside a yuilding

PROBLEM: Sentence: 'a close up of two polar bears near one another'. Replace the letter 'a' with 'b' in the sentence.

SOLUTION:
b close up of two polbr bebrs nebr one bnother