TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'a suitcase is sitting on a sidewalk near trees'. Replace the letter 's' with 'd' in the sentence.

SOLUTION: a duitcade id ditting on a didewalk near treed

PROBLEM: Sentence: 'a street pole stating three different street names and numbers'. Replace the letter 'm' with 't' in the sentence.

SOLUTION: a street pole stating three different street nates and nutbers

PROBLEM: Sentence: 'a cake that is shaped to look like a child's toy'. Replace the letter 'a' with 't' in the sentence.

SOLUTION:
t ctke thtt is shtped to look like t child's toy