TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'a bathroom with a white toilet next to a large window'. Replace the letter 'w' with 'x' in the sentence.

SOLUTION: a bathroom xith a xhite toilet next to a large xindox

PROBLEM: Sentence: 'this is a cute dog sticking his head out of the window of a red car'. Replace the letter 'e' with 'z' in the sentence.

SOLUTION: this is a cutz dog sticking his hzad out of thz window of a rzd car

PROBLEM: Sentence: 'two men are riding horses over an obstacle course jump'. Replace the letter 'e' with 'n' in the sentence.

SOLUTION:
two mnn arn riding horsns ovnr an obstacln coursn jump