Input (grade 13): East (ern) Francia (Regnum Francorum orientalium), known variously as Francia Orientalis or the Kingdom of the East Franks, was the realm allotted to Louis the German by the 843 Treaty of Verdun.
Output (grade 11): Eastern Francia (Regnum Francorum orientalium) was the land of Louis the German after the Treaty of Verdun of 843.