Input (grade 9): Sanga Monastery was built amid the ruins of the castle (or fort) Taktse (also Dagtse) Dzong (formerly Dechen Dzong) on the hill top.
Output (grade 10): Sanga Monastery was built in the ruins of the castle (or fort) Taktse (also Dagtse) Dzong (formerly Dechen Dzong) on the top of a hill.