TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'a woman holding the arm of a life size teddy bear in a guard outfit'. Replace the letter 'g' with 'a' in the sentence.

SOLUTION: a woman holdina the arm of a life size teddy bear in a auard outfit

PROBLEM: Sentence: 'a couple of horses with carriages at a building'. Replace the letter 'u' with 'm' in the sentence.

SOLUTION: a comple of horses with carriages at a bmilding

PROBLEM: Sentence: 'a city street at night with a clock tower in the back ground'. Replace the letter 'h' with 's' in the sentence.

SOLUTION:
a city street at nigst wits a clock tower in tse back ground