The three-letter door game

Animate a fifteen-second preschool alphabet game in a bright, uncluttered 3D playroom. A friendly round robot stands beside three large doors marked A, B, and C. Spend the first four seconds on door A opening to reveal one red apple, while a calm narrator says, "A, apple." Repeat with a blue ball behind B and an orange cat behind C, using the same camera height and a one-second pause after each word. End with all three objects arranged beneath their matching letters as the robot waves. Keep shapes simple, colors stable, and motion gentle. Use soft door clicks and a quiet musical bed, with no flashing effects or extra floating text.