Κοστρομα	singular, nominative	singular, nominative
	Κοστρομας	singular, genitive	singular, genitive
	Κοστρομα	singular, accusative	singular, accusative
	-	singular, vocative	singular, vocative
	Κοστρομες	plural, nominative	plural, nominative
	Κοστρομων	plural, genitive	plural, genitive
	Κοστρομες	plural, accusative	plural, accusative
	-	plural, vocative	plural, vocative