Task: Pos Tagging
Input (English): Sentence: For a brief period each year , the rays of the sun are warm enough to melt some of the snows piled a mile deep at the base of the headwalls , and then the pinnacles glisten in the daytime at high noon , and billions of gallons of water begin {{ their }} slow seepage under the glaciers and across the rockstrewn hanging valleys on their long , meandering journey to the sea -- running east past the sky-carving massifs of Gurla Mandhata and Kemchenjunga , then turning south and curling down through the jungles of Assam , past the Khasi Hills , and into Bengal , past Sirinjani and Madaripur , until the hard water of the melting snows mingles with the soft drainage of fields and at length fans out to meld with the teeming salt depths of the Bay of Bengal . 
Word: their
Output (English): DET