TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'a teddy bear playing a drum and a teddy bear playing a guitar'. Replace the letter 'd' with 'm' in the sentence.

SOLUTION: a temmy bear playing a mrum anm a temmy bear playing a guitar

PROBLEM: Sentence: 'a man swinging at a tennis with a racquet on a court'. Replace the letter 't' with 'c' in the sentence.

SOLUTION: a man swinging ac a cennis wich a racquec on a courc

PROBLEM: Sentence: 'a couple of little girls standing around a tennis ball'. Replace the letter 'i' with 'p' in the sentence.

SOLUTION:
a couple of lpttle gprls standpng around a tennps ball