CREATE TABLE table_27650 ("Letters" TEXT, "Organization" TEXT, "Nickname" TEXT, "Founding Date" TEXT, "Founding University" TEXT, "Type" TEXT)

What is the founding date if the letters are ?
SELECT "Founding Date" FROM table_27650 WHERE "Letters" = 'ΚΨΚ'
SELECT "Founding Date" FROM "table_27650" WHERE "Letters" = 'ΚΨΚ'