Input (grade 13): The history of Yerevan dates back to the 8th century BC, with the founding of the fortress of Erebuni in 782 BC by king Argishti I at the western extremity of the Ararat plain.
Output (grade 9): The history of Yerevan dates back to the 8th century BC, with the founding of the Urartian fortress of Erebuni in 782 BC.