Task: Pos Tagging
Input (English): Sentence: Petersen held discussions {{ with }} both Kumaratunga and the reclusive LTTE leader Velupillai Prabhakaran in the rebel stronghold of Kilinochchi without success , and chief Tamil rebel negotiator Anton Balasingham and Norwegian envoy Erik Solheim held closed - door talks at the international airport late Saturday in an effort to keep the salvage effort on track , diplomatic sources said . 
Word: with
Output (English): IN