Teacher:In this task, you're given a statement, further information available on a particular linked term from the statement, and a question. Your job is to generate the answer to the question by using the information provided. If there is no clear answer obtainable, output 'none'.
Teacher: Now, understand the problem? Solve this instance: Context: Early confrontations between the Sasanian Empire of Shapur II with the nomadic hordes from Central Asia called the "Chionites" were described by Ammianus Marcellinus Link Information: Shapur II ( ; New Persian: , Sapur), also known as Shapur II the Great, was the tenth Sasanian king (shah) of Iran. The longest-reigning monarch in Iranian history, he reigned for his entire 70-year life from 309 to 379. Question: How many years did the ruler of the Sasanian Empire when it had confrontations with the Chionites rule the empire?
Student:
Answer: 70-year