TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'there is a purse on the floor with its contents spilled out'. Replace the letter 'd' with 'v' in the sentence.

SOLUTION: there is a purse on the floor with its contents spillev out

PROBLEM: Sentence: 'a yellow fire truck parked in a parking lot'. Replace the letter 'a' with 'y' in the sentence.

SOLUTION: y yellow fire truck pyrked in y pyrking lot

PROBLEM: Sentence: 'a bus and a man walking at a bus stop'. Replace the letter 'a' with 'f' in the sentence.

SOLUTION:
f bus fnd f mfn wflking ft f bus stop