Input (grade 13): Many of the old Inca walls were at first thought to have been lost after the earthquake, but the granite retaining walls of the Qoricancha were exposed, as well as those of other ancient structures throughout the city.
Output (grade 12): Many of the old Inca walls were thought to have been lost after the earthquake, but the granite walls of the Koricancha were exposed, as well as many walls throughout the city.