The Arabic script is the official alphabet for Kazakhs in the Ili Kazakh Autonomous Prefecture of the Xinjiang Uyghur Autonomous Region of China. It was first introduced to the territory of Kazakhstan in the eleventh century and was traditionally used to write Kazakh until the introduction of a Latin alphabet in 1929. In 1924, Kazakh intellectual Akhmet Baitursynov attempted to reform the Arabic script to better suit Kazakh. The letters , , , and are used to represent sounds not found in the Arabic language.