The three major Christian denominations today accept a different number of Old Testament books, but they share a common element in their canons: the system of classifying the books according to the nature of the biblical works. Thus, the books are classified according to their nature into three groups, "Historical," "Poetic-Didactic," and "Prophetic." The tradition of the Orthodox Church accepts as "canonical" (books that belong to the canon), in addition to the 39 books of the Jewish Bible (which are titled according to the Septuagint), 10 additional ones (1 Esdras, Tobit, Judith, 1-2-3 Maccabees, Wisdom of Solomon, Wisdom of Sirach, Baruch, and the Letter of Jeremiah). The Roman Catholic Church followed a similar practice, ultimately accepting 46 books, which it distinguishes as "protocanonical" and "deuterocanonical." Finally, the Churches that emerged from the Reformation accepted the canon of the Jewish Bible with the 39 books.