TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'a teddy bear dressed in denim is laying on a floor'. Replace the letter 'i' with 'd' in the sentence.

SOLUTION: a teddy bear dressed dn dendm ds laydng on a floor

PROBLEM: Sentence: 'a person under an open umbrella in the sand'. Replace the letter 'd' with 'h' in the sentence.

SOLUTION: a person unher an open umbrella in the sanh

PROBLEM: Sentence: 'someone playing frisbee with a dog in the middle of a court'. Replace the letter 'd' with 'r' in the sentence.

SOLUTION:
someone playing frisbee with a rog in the mirrle of a court