Input (grade 13): In the poem, Beowulf, a hero of the Geats, battles three antagonists: Grendel, who has been attacking the resident warriors of a mead hall called Heorot in Denmark; Grendel's mother; and an unnamed dragon.
Output (grade 10): In the poem, Beowulf fights three monsters: Grendel and Grendel's mother, and later in his life an unnamed dragon.