Question: What are the width and height of the bounding box of the object with "keyboard" as their object class and (5, 647) as their coordinate?
SQL: SELECT T1.W, T1.H FROM IMG_OBJ AS T1 INNER JOIN OBJ_CLASSES AS T2 ON T1.OBJ_CLASS_ID = T2.OBJ_CLASS_ID WHERE T2.OBJ_CLASS = 'keyboard' AND T1.X = 5 AND T1.Y = 647