Input (grade 13): Middle Chinese, also called Ancient Chinese by the linguist Bernhard Karlgren, refers to the Chinese language spoken during Southern and Northern Dynasties and the Sui, Tang, and Song dynasties.
Output (grade 12): Middle Chinese, or Ancient Chinese as used by linguist Bernhard Karlgren is a name given to an older version of the Chinese language. People spoke it during Southern and Northern Dynasties and the Sui, Tang, and Song dynasties (6th century - 10th century).