Input (grade 13): Ehrenbreitstein Fortress (German: Festung Ehrenbreitstein) is a fortress on the mountain of the same name on the east bank of the Rhine opposite the town of Koblenz in the German state of Rhineland-Palatinate.
Output (grade 10): It was built on a mountain called Ehrenbreitstein on the right side of the Rhine opposite to the town of Koblenz in the German state of Rhineland-Palatinate.